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Question

Let f(x)=4cos^5x.
Find f'(x)
14 years ago

Answers

Reiny
YOu should know this one.

f(x) = 4(cos x)^5 , by chain rule

f'(x) = 20(cosx)^4 (-sinx)
= -20sinx(cos x)^4
14 years ago

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