関連ワード:  derivative of sin x 2 pi    derivative of sin 2x at x pi 2    derivative of sin x^2 at x=root pi    differentiation of 3 sin x pi 2    differentiation of sin 2 pi x    derivative of sin 2x pi 2    derivative of sin 2x pi    derivative of sin 2x pi 3    derivative of sin 2x pi 4    derivative of sin pi cos 2 x