[求助] 积分已有2人参与

3楼: Originally posted by alober at 2017-02-02 16:21:41
令z=2x则I=2\int_{0}^{\frac{\pi}{2}}(\sin x)^{\alpha}\sin(2kx)dx，因为
-i\int_{0}^{\pi}(2\cos\frac{t}{2})^pe^{it(q+\frac{p}{2}+1)}dt = \int_{0}^{1}(1+x)^px^qdx+e^{iq\pi}\int_{0}^{1}(1-x)^px^qdx
两边 ...