用exponential function行不?

来源: 2022-12-08 11:30:03 [旧帖] [给我悄悄话] 本文已被阅读:
$\displaystyle \sin(\theta)$ $\textstyle =$ $\displaystyle \frac{1}{2i} \left(e^{+i \theta} - e^{-i
\theta}\right)$