I needed to find the derivative of $\cos^3(x)$ and find it in a list of given derivatives, but I could not find $-3\sin(x)\cos^2(x)$, so I waited until I did more problems and the only one left was $-3\cos^3(x)\tan(x)$.
If anyone could show me the steps to convert $-3\sin(x)\cos^2(x)$ into $-3\cos^3(x)\tan(x)$, that would be awesome.
Thanks!