関連ワード:  integral of 2cos^2x    integral of 2cos 2x    integral of 2cos 2x 1    antiderivative of 2cos(2x)    integral of 2cos 2    integral of 2cos(2 theta)    integral of x 2cos 2x    integral of 2cos 2 2x    integral of sin 2cos 2    what is the integral of 2x