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Do now as a warm-up: Place an M&M in your mouth, but do NOT bite it. How is an M&M like a composite function? Write your answer on the index card. You have

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2.4 The Chain Rule ex. Compose these functions to find g(f(x)) if f(x)=sinx and g(x)= ex. If h(x) =, find two functions f and g so that h(x) = f(g(x)). Now, the other way Decompose: There is more than one correct answer

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y'= So a composite function is a function with layers! sin( ) cos( ) Composite functions do not have to have a trig function as a layer. 4

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Thm. The Chain Rule If y=f(m) is a differentiable function of m and m=g(x) is a differentiable function of x, then y= f(g(x)) is a differentiable function of x and Take the derivative of a composite function like you would unwrap a present inside a present inside a present-- one package at a time and from the outside toward the inside!

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So h’(x) =cos(m)*2x = 2x cos(x 2 )

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Thm. The General Power Rule is a special case of the Chain Rule u'(x)

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ex. Suppose that h(x)=f(g(x)) and f '(3)=2, g(5)=3, and g'(5)=7. Find h'(5).

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ex. Suppose h(x)=f(g(x)). Find h'(2). 1 1 f ' f 1 1 1 1 g' 1 1 g

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ex. Find the line that is tangent to the graph of y= at the point (2,2).

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ex. If find the derivative for all x where this function is differentiable., Look at a graph as a first step.

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True or False? The derivative of an odd function is even and the derivative of an even function is odd. True, now prove it! Odd function: f(-x) = -f(x) Take the derivative: [f '(-x)][-1] = -f '(x) so f '(-x) = f '(x) Thus, f ' is an even function. More info Answer

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