What is the derivative of $cos^2x$ ?

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Answer 1 · 2016-04-21T13:49:04

$(d y)/(d x)=-2cos x sin x$

$y=cos^2x$

$cos x=u$

$y=u^2$

$(d y)/(d u)=2u=2cosu$

$(d u)/(d x)=-sin x$

$(d y)/(d x)=(d y)/(d u)*(d u)/(d x)$

$(d y)/(d x)=-2cos x sin x$

What is the derivative of cos^2xcos^2x?