(sec^2x-sinx+1/x-1/(1+x^2))dx

题目

(sec^2x-sinx+1/x-1/(1+x^2))dx
怎么坐

答案

原式=∫sec^2xdx-∫sinxdx+∫1/x dx-∫1/(1+x^2) dx
=tanx+cosx+ln|x|-arctanx+C