What is the derivative of f(x)=cos3(x)f(x) = \cos^3(x)f(x)=cos3(x)?
−3sin2(x)cos(x)-3\sin^2(x)\cos(x)−3sin2(x)cos(x)
−3cos2(x)-3\cos^2(x)−3cos2(x)
3cos2(x)sin(x)3\cos^2(x)\sin(x)3cos2(x)sin(x)
−3cos2(x)sin(x)-3\cos^2(x)\sin(x)−3cos2(x)sin(x)