∫ cos(pi/x^5)/x^6=?
问题描述：
∫ cos(pi/x^5)/x^6=?
答
∫cos(π/x^5)/x^6dx
=-1/(5π)·∫cos(π/x^5)d(π/x^5)
=-1/(5π)·sin(π/x^5)+C