Posted by haifeng on 2023-11-08 19:15:49 last update 2023-11-08 19:15:49 | Answers (2) | 收藏
证明下列不等式:
\[ \tan x > x+\frac{x^3}{3},\quad\forall\ x\in(0,\frac{\pi}{2}). \]
