摘要: \( \because \sin(\alpha+\beta)=|CD|/|OC|,|OC|=1 \) \( \therefore \sin(\alpha+\beta)=|CD| \) \( \because \angle OCE=\pi/2-\beta,\angle OCD=\pi/2-(\beta 阅读全文
posted @ 2024-03-28 17:18 volcanst 阅读(8) 评论(0) 推荐(0) 编辑