摘要: First \[\begin{eqnarray} y=\tan{\frac{2x}{1+x^{2}}},\quad y'=? \\ \\ y=\tan{u}, \ u=\frac{2x}{1+x^{2}},\quad y'=(\tan{u})'(u)' \\ \\ (\tan{u})'=\sec^{ 阅读全文
posted @ 2022-08-16 17:58 Preparing 阅读(566) 评论(0) 推荐(0) 编辑