摘要: \(sin(2\theta)=2sin(\theta)cos(\theta)=\frac{2tan(\theta)}{1+tan^2(\theta)}\) \(cos(2\theta)=cos^2(\theta)-sin^2(\theta)=\frac{1-tan^2(\theta)}{1+tan^ 阅读全文
posted @ 2025-11-14 20:10 nick_zha 阅读(5) 评论(0) 推荐(0)