関連ワード:  integral of sin x 4    integral of sin x 4 dx    integration of sin x 4x    integral of sin 4 x from 0 to pi    integral of sin 47 x    integral of sin 4 x 2    integral of sin 4x x 2    integral of sin 4 x from 0 to pi 2    antiderivative of sin x 4    integration of sin 4x/sin x