関連ワード:  integral of sin 2 times cos 2    integral of sin 2x times cos 2x    integral of sin 2 x cos 2x    integration of sin 2 x cos 2x dx    integration of sin 2 x cos 2    integral of sin squared times cos squared    integral of sin 2 x cos 2 x dx    integral of sin 2 x 1 cos 2x    integral of sin 2 x 1 cos 2x dx    integration of 1 sin 2 x cos 2