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) ...
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