Posted by haifeng on 2021-11-20 15:47:53 last update 2023-03-18 08:19:15 | Answers (1) | 收藏
求下列不定积分
$\displaystyle\int\frac{x^2}{1+\cos x}\mathrm{d}x$
$\displaystyle\int\frac{x^2}{\sin^2 x}\mathrm{d}x$
$\displaystyle\int\frac{4}{3+\cos 4x}\mathrm{d}x$
