摘要: - for an arc: $\frac{r\sin\theta}{\theta}$ from the centre moment: $\int_{-\theta}^\theta r\cos\theta\cdot r{\rm d}\theta=r^2\cdot[\sin\theta]|_{-\the 阅读全文
posted @ 2024-05-23 17:10 Corylus 阅读(20) 评论(0) 推荐(0) 编辑