関連ワード:  integration of sin pi 4 x 2    integration of e x sin pi 4 x 2    integrate ex sin pi 4 x 2    integration of e 2x sin pi 4 x    integration of e 2x sin pi 4 x dx    integral e x 2 sin pi 4 x 2 dx    integration of pi 4 to pi 4 sin 2 x dx    integration of 0 to pi 4 x 1 cos 2x sin 2x    integration of 0 to pi 4 x dx 1 cos 2x sin 2x    what is the integral of sin^4x