[交流] 这个积分有什么技巧吗 已有12人参与

5楼: Originally posted by f.j.y.good at 2014-04-04 10:15:48
貌似不难的

9楼: Originally posted by shizheng0124 at 2014-04-04 13:26:01
\int {\frac{{{{\sin }^4}\left( x \right) + {{\cos }^4}\left( x \right)}}{{1 + 4\sin \left( x \right)cos\left( x \right)}}dx}
= \int {\frac{{{{\sin }^4}\left( x \right) + {{\cos }^4}\left( x \right) ...