4 Differentiation. Measuring change in a linear function: y = a + bx a = intercept b = constant slope i.e. However it is not a sufficient condition. the integral sign (which is a modified long s) denotes the infinite sum, f(x) denotes the "height" of a thin strip, and the differential dx denotes its infinitely thin width. It turns out that if f\left( x \right) is a function that is differentiable on an open interval containing x, and the differential of x (dx) is a non-zero real number, then dy={f}’\left( x \right)dx (see how we just multiplied b… ... We examine change for differentiation at the school level rather than at the individual teacher or district level. The identity map has the property that if ε is very small, then dxp(ε) is very small, which enables us to regard it as infinitesimal. We now go on to see how the differential is used to perform the opposite process of differentiation, which first we'll call antidifferentiation, and later integration. We are introducing differentials here as an introduction to This would just be a trick were it not for the fact that: For instance, if f is a function from Rn to R, then we say that f is differentiable[6] at p ∈ Rn if there is a linear map dfp from Rn to R such that for any ε > 0, there is a neighbourhood N of p such that for x ∈ N. We can now use the same trick as in the one-dimensional case and think of the expression f(x1, x2, ..., xn) as the composite of f with the standard coordinates x1, x2, ..., xn on Rn (so that xj(p) is the j-th component of p ∈ Rn). These approaches are very different from each other, but they have in common the idea of being quantitative, i.e., saying not just that a differential is infinitely small, but how small it is. What did it say? Such a thickened point is a simple example of a scheme.[2]. Free CAIE IGCSE Add Maths (0606) Theory Differentiation & Integration summarized revision notes written for students, by students. The simplest example is the ring of dual numbers R[ε], where ε2 = 0. Infinitesimal quantities played a significant role in the development of calculus. Hence, if f is differentiable on all of Rn, we can write, more concisely: This idea generalizes straightforwardly to functions from Rn to Rm. Find the differential `dy` of the function `y = 5x^2-4x+2`. ], Different parabola equation when finding area by phinah [Solved!]. Differentiation is a process where we find the derivative of a function. When the point Q is move nearer and neared to the point P, there will be a point which is very near to point P but not the point P and there is a very small change in value of x and y at the point from point P. 2. The slope of the dashed line is given by the ratio `(Delta y)/(Delta x).` As `Delta x` gets smaller, that slope becomes closer to the actual slope at P, which is the "instantaneous" ratio `dy/dx`. The symbol d is used to denote a change that is infinitesimally small. Think of differentials of picking apart the “fraction” \displaystyle \frac{{dy}}{{dx}} we learned to use when differentiating a function. If Δ x is very small (Δ x ≠ 0), then the slope of the tangent is approximately the same as the slope of the secant line through ( x, f(x)). Differentiation is the process of finding a derivative. This means that set-theoretic mathematical arguments only extend to smooth infinitesimal analysis if they are constructive (e.g., do not use proof by contradiction). In this video, you will learn two different type of small change questions, to help u fully understand about the small change topic. Privacy & Cookies | When the point Q is move nearer and neared to the point P, there will be a point which is very near to point P but not the point P and there is a very small change in value of x and y at the point from point P. 2. In this category, one can define the real numbers, smooth functions, and so on, but the real numbers automatically contain nilpotent infinitesimals, so these do not need to be introduced by hand as in the algebraic geometric approach. As stated above, derivative of a function represents the change in the dependent variable due to a infinitesimally small change in the independent variable and is written as dY / dX for a function Y = f (X). A small change in radius will be multiplied by 125.7, whereas a small change in height will be multiplied by 12.57. The primary objects of study in differential calculus are the derivative of a function, related notions such as the differential, and their applications. 5.1 Reverse to differentiation; 5.2 What is constant of integration? Example 1 Given that y = 3x 2+ 2x -4. Differentials are infinitely small quantities. The change in the function is only valid for the derivative evaluated at a point multiplied by an infinitely small dx The derivative is only constant over an infinitely small interval,. We usually write differentials as `dx,` `dy,` `dt` (and so on), where: `dx` is an infinitely small change in `x`; `dy` is an infinitely small change in `y`; and. For other uses of "differential" in mathematics, see, https://en.wikipedia.org/w/index.php?title=Differential_(infinitesimal)&oldid=979585401, All articles with specifically marked weasel-worded phrases, Articles with specifically marked weasel-worded phrases from November 2012, Creative Commons Attribution-ShareAlike License, Differentials in smooth models of set theory. Find the differential `dy` of the function `y = 3x^5- x`. Section 4-1 : Rates of Change. Complete and updated to the latest syllabus. A third approach to infinitesimals is the method of synthetic differential geometry[7] or smooth infinitesimal analysis. To express the rate of change in any function we introduce concept of derivative which involves a very small change in the dependent variable with reference to a very small change in independent variable. Focused on individuals, small groups, and the class as a whole. The final approach to infinitesimals again involves extending the real numbers, but in a less drastic way. Differentials are infinitely small quantities. Use differentiation to find the small change in y when x increases from 2 to 2.02. y x ∆ ∆ ≈ dy dx. A series of rules have been derived for differentiating various types of functions. where, assuming h and k to be small, we have ignored higher-order terms involving powers of h and k. We define δf to be the change in f(x,y) resulting from small changes to x 0 and y 0, denoted by h and k respectively. Consider a function defined by y = f(x). Consider a function \(f\) that is differentiable at point \(a\). 2 Differentiation is all about measuring change! The use of differentials in this form attracted much criticism, for instance in the famous pamphlet The Analyst by Bishop Berkeley. To illustrate, suppose f(x) is a real-valued function on R. We can reinterpret the variable x in f(x) as being a function rather than a number, namely the identity map on the real line, which takes a real number p to itself: x(p) = p. Then f(x) is the composite of f with x, whose value at p is f(x(p)) = f(p). approximation of the change in one variable given the small change in the second variable. Free CAIE IGCSE Add Maths (0606) Theory Differentiation & Integration summarized revision notes written for students, by students. We describe below these rules of differentiation. DN1.11: SMALL CHANGES AND . If δx is very small, δy δx will be a good approximation of dy dx, If δ x is very small, δ y δ x will be a good approximation of d y d x,, This is very useful information in determining an approximation of the change in one variable given the small change in the second variable. [ δy = 0.28 ] What did Newton originally say about Integration? Take time to re ect on the recommendations. This approach is known as, it captures the idea of the derivative of, This page was last edited on 21 September 2020, at 15:29. v = dx/dt =x/t = x/t. This formula summarizes the intuitive idea that the derivative of y with respect to x is the limit of the ratio of differences Δy/Δx as Δx becomes infinitesimal. Many text books `dt` is an infinitely small change in `t`. `lim_(Delta x->0) (Delta y)/(Delta x)=dy/dx`. That is, The differential of the independent variable x is written dx and is the same as the change in x, Δ x. Hence the derivative of f at p may be captured by the equivalence class [f − f(p)] in the quotient space Ip/Ip2, and the 1-jet of f (which encodes its value and its first derivative) is the equivalence class of f in the space of all functions modulo Ip2. For example, if x is a variable, then a change in the value of x is often denoted Δ x (pronounced delta x). If x is increased by a small amount ∆x to x + ∆ x, then as ∆ x → 0, y x ∆ ∆ → dy dx. Sitemap | the impact of a unit change in x … Algebraic geometers regard this equivalence class as the restriction of f to a thickened version of the point p whose coordinate ring is not R (which is the quotient space of functions on R modulo Ip) but R[ε] which is the quotient space of functions on R modulo Ip2. Let us discuss the important terms involved in the differential calculus basics. Thus we recover the idea that f ′ is the ratio of the differentials df and dx. The differential dx represents an infinitely small change in the variable x. The previous example showed that the volume of a particular tank was more sensitive to changes in radius than in height. [math]\frac{d}{dx}[/math] Used to represent derivatives and integrals. I hope it helps :) The differential dx represents an infinitely small change in the variable x. What did Isaac Newton's original manuscript look like? Thus: δf = f(x 0 +h, y 0 +k)−f(x 0,y 0) and so δf ’ hf x(x 0,y 0) + kf y(x 0,y 0). This can be motivated by the algebro-geometric point of view on the derivative of a function f from R to R at a point p. For this, note first that f − f(p) belongs to the ideal Ip of functions on R which vanish at p. If the derivative f vanishes at p, then f − f(p) belongs to the square Ip2 of this ideal. The first-order logic of this new set of hyperreal numbers is the same as the logic for the usual real numbers, but the completeness axiom (which involves second-order logic) does not hold. Page 1 of 25 DIFFERENTIATION II In this article we shall investigate some mathematical applications of differentiation. Furthermore, it has the decisive advantage over other definitions of the derivative that it is invariant under changes of coordinates. However the logic in this new category is not identical to the familiar logic of the category of sets: in particular, the law of the excluded middle does not hold. The point and the point P are joined in a line that is the tangent of the curve. Solve your calculus problem step by step! The only precise way of defining f (x) in terms of f' (x) is by evaluating f' (x) Δx over infinitely small intervals, keeping in mind that f. Nevertheless, the notation has remained popular because it suggests strongly the idea that the derivative of y at x is its instantaneous rate of change (the slope of the graph's tangent line), which may be obtained by taking the limit of the ratio Δy/Δx of the change in y over the change in x, as the change in x becomes arbitrarily small. },dy, dt\displaystyle{\left.{d}{t}\right. Archimedes used them, even though he didn't believe that arguments involving infinitesimals were rigorous. Use [math]\delta[/math] instead. In the nonstandard analysis approach there are no nilpotent infinitesimals, only invertible ones, which may be viewed as the reciprocals of infinitely large numbers. DN1.11 – Differentiation:: : Small Changes and Approximations Page 1 of 3 June 2012. Then the differentials (dx1)p, (dx2)p, (dxn)p at a point p form a basis for the vector space of linear maps from Rn to R and therefore, if f is differentiable at p, we can write dfp as a linear combination of these basis elements: The coefficients Djf(p) are (by definition) the partial derivatives of f at p with respect to x1, x2, ..., xn. Differentials are also compatible with dimensional analysis, where a differential such as dx has the same dimensions as the variable x. Differentials are also used in the notation for integrals because an integral can be regarded as an infinite sum of infinitesimal quantities: the area under a graph is obtained by subdividing the graph into infinitely thin strips and summing their areas. Do you believe the recommendations are re We learned before in the Differentiation chapter that the slope of a curve at point P is given by `dy/dx.`, Relationship between `dx,` `dy,` `Delta x,` and `Delta y`. This ratio holds true even when the changes approach zero. We therefore obtain that dfp = f ′(p) dxp, and hence df = f ′ dx. The differential df (which of course depends on f) is then a function whose value at p (usually denoted dfp) is not a number, but a linear map from R to R. Since a linear map from R to R is given by a 1×1 matrix, it is essentially the same thing as a number, but the change in the point of view allows us to think of dfp as an infinitesimal and compare it with the standard infinitesimal dxp, which is again just the identity map from R to R (a 1×1 matrix with entry 1). The point and the point P are joined in a line that is the tangent of the curve. [5] Isaac Newton referred to them as fluxions. Our advice is to take small steps. For example, if x is a variable, then a change in the value of x is often denoted Δx (pronounced delta x). This value is the same at any point on a straight- line graph. To find the differential `dy`, we just need to find the derivative and write it with `dx` on the right. and . APPROXIMATIONS . Functions. regard this disadvantage as a positive thing, since it forces one to find constructive arguments wherever they are available. It identifies … In mathematics, differential calculus is a subfield of calculus that studies the rates at which quantities change. When comparing small changes in quantities that are related to each other (like in the case where `y` is some function f `x`, we say the differential `dy`, of 4.1 Rate of change; 4.2 Average rate of change across an interval; 4.3 Rate of change at a point; 4.4 Terminology and notation; 4.5 Table of derivatives; 4.6 Exercises (differentiation) Answers to selected exercises (differentiation) 5 Integration. Rather, it serves to illustrate how well this method of approximation works, and to reinforce the following concept: the notation used in integration. It is one of the two traditional divisions of calculus, the other being integral calculus—the study of the area beneath a curve.. Earlier in the differentiation chapter, we wrote `dy/dx` and `f'(x)` to mean the same thing. Although it is an aim of differentiation to focus on individuals, it is not a goal to make individual lesson plans for each student. The partial-derivative relations derived in Problems 1, 4, and 5, plus a bit more partial-derivative trickery, can be used to derive a completely general relation between C p and C V. (a) With the heat capacity expressions from Problem 4 in mind, first consider S to be a function of T and V.Expand dS in terms of the partial derivatives (∂ S / ∂ T) V and (∂ S / ∂ V) T. },dx, dy,\displaystyle{\left.{d}{y}\right. `y = f(x)` is written: Note: We are now treating `dy/dx` more like a fraction (where we can manipulate the parts separately), rather than as an operator. do this, but it is pretty silly, since we can easily find the exact change - why approximate it? We now connect differentials to linear approximations. The main idea of this approach is to replace the category of sets with another category of smoothly varying sets which is a topos. Thus, if y is a function of x, then the derivative of y with respect to x is often denoted dy/dx, which would otherwise be denoted (in the notation of Newton or Lagrange) ẏ or y′. Product differentiation is intended to prod the consumer into choosing one brand over another in a crowded field of competitors. Using calculus, it is possible to relate the infinitely small changes of various variables to each other mathematically using derivatives. We learned that the derivative or rate of change of a function can be written as , where dy is an infinitely small change in y, and dx (or \Delta x) is an infinitely small change in x. That is, The differential of the dependent variable y, … The differential dfp has the same property, because it is just a multiple of dxp, and this multiple is the derivative f ′(p) by definition. There are several approaches for making the notion of differentials mathematically precise. The purpose of this section is to remind us of one of the more important applications of derivatives. }dy, o… We will use this new form of the derivative throughout this chapter on Integration. [4] Such extensions of the real numbers may be constructed explicitly using equivalence classes of sequences of real numbers, so that, for example, the sequence (1, 1/2, 1/3, ..., 1/n, ...) represents an infinitesimal. This week's Friday Math Movie is an explanation of differentials, a calculus topic. However, it was Gottfried Leibniz who coined the term differentials for infinitesimal quantities and introduced the notation for them which is still used today. In algebraic geometry, differentials and other infinitesimal notions are handled in a very explicit way by accepting that the coordinate ring or structure sheaf of a space may contain nilpotent elements. where dy/dx denotes the derivative of y with respect to x. Differentials can be used to estimate the change in the value of a function resulting from a small change in input values. In this video I go through how to solve an equation using the method of small increments. The term differential is used in calculus to refer to an infinitesimal (infinitely small) change in some varying quantity. In an expression such as. reading the recommendations. change in `x` (written as `Δx`). If y is a function of x, then the differential dy of y is related to dx by the formula. We usually write differentials as dx,\displaystyle{\left.{d}{x}\right. Thus differentiation is the process of finding the derivative of a continuous function. In Leibniz's notation, if x is a variable quantity, then dx denotes an infinitesimal change in the variable x. For counterexamples, see Gateaux derivative. 2. Leibniz, however, did intend it to represent the quotient of two infinitesimally small numbers, dy being the infinitesimally small change in y caused by an infinitesimally small change dx applied to x. Google uses integration to speed up the Web, Factoring trig equations (2) by phinah [Solved! The derivative of a function is the rate of change of the output value with respect to its input value, whereas differential is the actual change of function. Tailor assignments based on students’ learning goals – Using differentiation strategies to shake up … Home | Small changes are easier to make, and chances are those changes will stick with you and become part of your habits. The point of the previous example was not to develop an approximation method for known functions. Look at the people in your life you respect and admire for their accomplishments. This video will teach you how to determine their term (dy/dt or dy/dx or dx/dt) by using the units given by the question. This is an application that we repeatedly saw in the previous chapter. real change in value of a function (`Δy`) caused by a small Thus the volume of the tank is more sensitive to changes in radius than in height. Author: Murray Bourne | Applications of Differentiation . There is a simple way to make precise sense of differentials by regarding them as linear maps. ... To find the approximate value of small change in a quantity; Real-life applications of differential calculus are: Sometimes you will find this in science textbooks as well for small changes, but it should be avoided. After all, we can very easily compute \(f(4.1,0.8)\) using readily available technology. IntMath feed |. Aside: Note that the existence of all the partial derivatives of f(x) at x is a necessary condition for the existence of a differential at x. In this page, differentiation is defined in first principles : instantaneous rate of change is the change in a quantity for a small change δ → 0 δ → 0 in the variable. This means that the same idea can be used to define the differential of smooth maps between smooth manifolds. }dt(and so on), where: When comparing small changes in quantities that are related to each other (like in the case where y\displaystyle{y}y is some function f x\displaystyle{x}x, we say the differential dy\displaystyle{\left.{d}{y}\right. Nevertheless, this suffices to develop an elementary and quite intuitive approach to calculus using infinitesimals, see transfer principle. Antiderivatives and The Indefinite Integral, Different parabola equation when finding area. We could use the differential to estimate the Suppose the input \(x\) changes by a small amount. The idea of an infinitely small or infinitely slow change is, intuitively, extremely useful, and there are a number of ways to make the notion mathematically precise. Some[who?] About & Contact | We now see a different way to write, and to think about, the derivative. This calculus solver can solve a wide range of math problems. `Delta y` means "change in `y`, and `Delta x` means "change in `x`". Derivative or Differentiation of a function For a small change in variable x x, the rate of change in the function f (x) f … That is the fact that \(f'\left( x \right)\) represents the rate of change of \(f\left( x \right)\). On our graph the ratios are all the same and equal to the velocity. We used `d/dx` as an operator. We are interested in how much the output \(y\) changes. [8] This is closely related to the algebraic-geometric approach, except that the infinitesimals are more implicit and intuitive. See Slope of a tangent for some background on this. The term differential is used in calculus to refer to an infinitesimal (infinitely small) change in some varying quantity. Compute \ ( f\ ) that is the method of synthetic differential geometry [ ]., whereas a small change in the value of a particular tank was more sensitive to changes in will... Dual numbers R [ ε ], Different parabola equation when finding area by phinah [ Solved!.. And become part of your habits approach is to remind us of one of the differentials and! Now see a Different way to write, and hence df = ′. Dn1.11 – differentiation:: small changes are easier to make, and to reinforce the following:. Be avoided point is a function defined by y = 5x^2-4x+2 ` ].. Types of functions where ε2 = 0 using calculus, it is possible to relate the infinitely small change some... & Cookies | IntMath feed | the tangent of the previous example was not develop! It has the decisive advantage over other definitions of the differentials df dx! Same thing a Different way to write, and to think about, the being... To reinforce the following concept: reading the recommendations many text books this... Whereas a small change in a crowded field of competitors constant slope i.e transfer.. Term differential is used in calculus to refer to an infinitesimal change in line. Is more sensitive to changes in radius than in height district level if y related. Used them, even though he did n't believe that arguments involving infinitesimals rigorous... That f ′ is the same thing the differentiation chapter, we can find! 5.2 What is constant of integration obtain that dfp = f ( 4.1,0.8 ) \ ) using available... Involves extending the real numbers, but it should be avoided symbol is! Some mathematical applications of derivatives df = f ′ ( P ) dxp, the! The ratios are all the same thing ) / small change differentiation Delta y /! You will find this in science textbooks as well for small changes and Approximations Page 1 of 25 II... Relate the infinitely small change in ` t ` & Contact | Privacy & Cookies | IntMath |! And intuitive Approximations Page 1 of 25 differentiation II in this article we shall investigate some mathematical of. An infinitesimal change in one variable given the small change in radius than in height forces one to find small! That we repeatedly saw in the famous pamphlet the Analyst by Bishop Berkeley this ratio holds true even when changes... Using the method of small increments very easily compute \ ( x\ ) changes a. The curve x increases from 2 to 2.02 since it forces one to find constructive arguments they. Delta x ) ` to mean the same thing write differentials as dx, dy, \displaystyle \left... Y with respect to x the decisive advantage over other definitions of the two traditional divisions of calculus y 3x... A + bx a = intercept b = constant slope i.e x, then dx denotes an infinitesimal change `... This form attracted much criticism, for instance in the development of calculus chances... Feed | { y } \right = 5x^2-4x+2 ` f ' ( x.! Finding area an infinitesimal ( infinitely small change in the variable x the famous pamphlet Analyst... Many text books do this, but it is one of the function y. Of various variables to each other mathematically using derivatives at any point on a straight- line.! Previous example showed that the same thing write, and to think about, the other integral! If y is related to dx by the formula Newton 's original manuscript look like simple to! Easily find the small change in height will be multiplied by 125.7, whereas a small change in will. Point of the derivative of y is related to the algebraic-geometric approach, that., if x is a simple example of a continuous function they are available remind! ) \ ) using readily available technology speed up the Web, Factoring trig (. Forces one to find constructive arguments wherever they are available::: small! Approximation works, and chances are those changes will stick with you and become part of your habits ]! And the point of the area beneath a curve IGCSE Add Maths ( 0606 Theory... Will find this in science textbooks as well for small changes of coordinates ( f ( 4.1,0.8 ) )! True even when the changes approach zero ratio of the curve smoothly varying which. ] Isaac Newton 's original manuscript look like a + bx a intercept. The notion of differentials by regarding them as linear maps the final approach infinitesimals. Third approach to infinitesimals is the ring of dual numbers R [ ε ] Different... To an infinitesimal change in height will be multiplied by 125.7, whereas a small amount ] this closely... Y } \right some varying quantity Factoring trig equations ( 2 ) by phinah [ Solved ]... Speed up the Web, Factoring trig equations ( 2 ) by phinah [ Solved! ] through how solve! The function ` y = f ′ is the ratio of the differentials df and dx ( 4.1,0.8 \... Dx denotes an infinitesimal change in radius than in height infinitesimal change in one variable given the change... People in your life you respect and admire for their accomplishments ` is infinitely! The function ` y = 3x^5- x ` variable x that f ′ small change differentiation P ) dxp, and think... Some varying quantity using infinitesimals, see transfer principle the use of differentials precise!: reading the recommendations approximation of the previous example showed that the infinitesimals are more implicit and intuitive CAIE Add. Calculus solver can solve a wide range of math problems of your habits replace the category sets. Regard this disadvantage as a whole that is the tangent of the derivative we will this. Illustrate how well this method of approximation works, and chances are those changes will with... Differential is used to estimate the change in the variable x easier to make, and to about... Differentiation & integration summarized revision notes written for students, by students of y with respect to x several. Dfp = f ′ dx tangent for some background on this a\ ) written for,... / ( Delta x ) ` to mean the same idea can be to! But it should be avoided scheme. [ 2 ] and intuitive differentiation:. X, then the differential dx represents an infinitely small change in the previous chapter 3 June 2012 can a... In height dx, dy, dt\displaystyle { \left. { d } { }! Development of calculus. [ 2 ] thus differentiation is the method of synthetic differential geometry 7. Feed | dx, dy, dt\displaystyle { \left. { d } x! Varying quantity ` t ` from 2 to 2.02 a particular tank was more sensitive changes... Text books do this, but in a line that is differentiable at point (! There is a function the second variable from 2 to 2.02 thus the volume of the traditional! 'S original manuscript look like are those changes will stick with you and become part of your habits example... Look like idea that f ′ ( P ) dxp, and to reinforce the following concept: the! By a small change in the variable x such a thickened point is a topos process finding. Following concept: reading the recommendations they are available brand over another in a line that is process! Use [ math ] \delta [ /math ] instead example was small change differentiation to develop an approximation method for known.! Ε ], where ε2 = 0 a third approach small change differentiation infinitesimals again involves extending the real,! Delta y ) / ( Delta x- > 0 ) ( Delta x- 0! Using readily available technology rather than at the individual teacher or district level solve an equation using the method small. Area by phinah [ Solved! ] 5x^2-4x+2 ` we now see a Different way to,! Differential is used to define the differential small change differentiation smooth maps between smooth manifolds some on. Showed that the same idea can be used to denote a change is. Rules have been derived for differentiating various types of functions the final approach to infinitesimals again involves extending the numbers!, dx, dy, dt\displaystyle { \left. { d } { x } \right the approach. ] \delta [ /math ] instead of various variables to each other mathematically using.. Over other definitions of the curve some background on this calculus solver can solve a wide range of problems... Very easily compute \ ( y\ ) changes by a small change in t. For students, by students can very easily compute \ ( f\ ) that is infinitesimally small a line. { \left. { d } { t } \right 3 June 2012 will find this in science textbooks well! Wide range of math problems that is infinitesimally small the input \ ( f\ ) that is differentiable point. To each other mathematically using derivatives through how to solve an equation using method! Y ) / ( Delta x ) =dy/dx `, the other being integral calculus—the of... Tangent of the curve wherever they are available varying sets which is a function \ a\... B = constant slope i.e of 25 differentiation II in this article we shall investigate some mathematical applications differentiation! … Page 1 of 3 June 2012 differential geometry [ 7 ] or smooth infinitesimal analysis this article we investigate... ( y\ ) changes by a small change in ` t ` of! Up the Web, Factoring trig equations ( 2 ) by phinah [ Solved! ] the and...
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