関連ワード:  integration of 1 2 sin 2 x    integration of dx 1 2 sin 2 x    integrate 1 2 sin 2 x dx from 0 to pi 4    integration of 1 2 sin x cos 2 x    integration of 1 2 sin x cos 2 x dx    integration of 1 sin 2 x cos 2 x dx is equal to    integration of 1 sin 2 x cos 2 x is equal to    integration of 1 2 sin x sin 2x    integration of 1 cos 2x sin 2 x    integration of 1 2 sin x sin 2x dx