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How to find the derivative of cos^2x? I seem to be confused.
I was told to use the chain rule, but I don't see how it can apply.
Can't I just substitute (cos x)(cos x) in its place and then use the product rule? Isn't cos^2 x = (cos x)(cos x)?
Please let me know if I am right. If not, then please explain how to use the chain rule in...; How are you getting: ?

Respuesta :

vp6325
the answer is as follows
-2sin^2x

explanation:
d(cos^2x)/dx= -sin^2x × d(2x)/dx
= -2sin^2x

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