関連ワード:  integration of sin 4 x 2    integration of sin 4x x 2    integration of sin x 2    integrate sin pi 4 x 2    int sin^(4x cos^(2x dx    integration of sin x 4 cos 2 x 1    integration of dx 1 4 sin 2 x    integration of sin 4 x cos 2 x dx    integration of x 4 sin 2x    integration of sin 4x cos 2 x