图片合集

1. \(sin(2\theta)=2sin(\theta)cos(\theta)=\frac{2tan(\theta)}{1+tan^2(\theta)}\)
2. \(cos(2\theta)=cos^2(\theta)-sin^2(\theta)=\frac{1-tan^2(\theta)}{1+tan^2(\theta)}\)
3. \(tan(2\theta)=\frac{2tan(\theta)}{1-tan^2(\theta)}\)
4. \(sin^2\theta= \frac {1-cos(2\theta)}2\)
5. \(cos^2\theta=\frac {1+cos(2\theta)}2\)
6. $ tan^2\theta=\frac{1-cos(2\theta)}{1+cos(2\theta)}$