Posted by haifeng on 2014-10-10 13:25:15 last update 2014-10-10 13:25:15 | Answers (1) | 收藏
设 $\lim\limits_{n\rightarrow+\infty}x_n$ 存在, 用定义证明
\[ \lim_{n\rightarrow+\infty}n\sin\frac{x_n}{n^2}=0. \]
