Find the derivative of f(x)=sin3(x)f(x) = \sin^3(x)f(x)=sin3(x).
3sin2(x)cos(x)3 \sin^2(x) \cos(x)3sin2(x)cos(x)
3cos2(x)3 \cos^2(x)3cos2(x)
3sin2(x)3 \sin^2(x)3sin2(x)
cos3(x)\cos^3(x)cos3(x)