Question

Find the derivative of y=(cosX)^3

Answer 1

is this
\[y=\cos^3(x)\]?

Answer 2

yes

Answer 3

if so
\[y'=3\cos^2(x)\times -\sin(x)=-3\cos^2(x)\sin(x)\] by the "chain rule"

Answer 4

Thank you

Answer 5

yw