Posted by haifeng on 2016-04-28 19:29:21 last update 2016-04-28 19:31:25 | Answers (1) | 收藏
求不定积分
\[ \int\frac{x^2+1}{x\sqrt{1+x^4}}dx \]
[Hint] 令 $x^2=\tan t$, $t\in(0,\frac{\pi}{2})$.
