∫（arctanx/1+x²）dx怎么算,

∫（arctanx/1+x²）dx怎么算,
∫（arctanx/1+x²）dx怎么算,

∫（arctanx/1+x²）dx怎么算,
老实说一楼回答的问题有一些 题目是用分部积分计算
∫（arctanx/1+x²）dx=∫arctanxdarctanx
=1/2(arctanx)^2+C(常数)

=∫arctanxdarctanx
=1/2*arctan^2 x