Can someone please explain to me how to find the antiderivative of x^3/3(cosmx)? I'm trying to solve the interval of x^2cosmx dx and I am at the point where I need to find the antiderivative of x^3/3(cosmx). I don't have any idea how to solve this. I would know how to solve it if I had to find the derivative, but I don't know what to do here since its the antiderivative.
Thank you very much