関連ワード:  integral of sin x 3 dx    integral of x sin 3x dx    integration of 4 sin x 3 dx    integration of sin inverse x 3 dx    integration of x sin 3x dx is equal to    integral of x 2 sin x 3 dx    integration of x square sin x 3 dx    integration of sin x cos 3x dx    integral of sin 3 x cos x dx    integral of x 3 sinx dx