Chapter 3 Chain Rule.

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Presentation transcript:

Chapter 3 Chain Rule

Chain rule Derivative of outside function times derivative of the inside function

The Chain Rule Remember the composition of two functions? The chain rule is used when you have the composition of two functions.

f(x) = x3 Find y’ for y = (x2 + 1)3 g(x) = x2 + 1 y’ = 3(x2 + 1)2 (2x) = 6x(x2 + 1)2 Find y’ for y = (3x – 2x2)3 y’ = 3(3x – 2x2)2(3 – 4x) Find f’(x) for

Differentiate rewritten as = -7(2t – 3)-2 g’(t) = 14(2t – 3)-3(2) Differentiate rewritten as Factor

Differentiate rewritten as Bot * Top’ – Top * Bot’ (Bot)2 Quotient Rule

Differentiate

Derivatives of Trigonometric Functions

Applying the Chain Rule to trigonometric functions y = sin 2x y = cos (x – 1) y = tan 3x y = cos (3x2) y = cos2 3x y’ = (cos 2x) (2) = 2 cos 2x y’ = -sin (x – 1) (1) = -sin (x – 1) y’ = sec2 3x (3) = 3 sec2 3x y’ = -sin (3x2) (6x) = -6x sin (3x2) rewritten as y = (cos 3x)2 y’ = 2(cos 3x)1 (-sin 3x) (3) y’ = -6 cos 3x sin 3x

Differentiate rewritten as