関連ワード:  what is the integral of cos^2x    what's the integral of cos 2x    what's the antiderivative of cos 2x    what is the integral of cos 2x dx    integral of cos^2 x dx    what is the integral of cos 2x 2    what is the integral of cos 2xsinx    what's the integral of 1 cos 2x    what is the integral of cosine 2x    what's the antiderivative of cos x 2