Trigonometry¶

$sin\theta = \frac{opp}{hyp}$ $cos\theta = \frac{adj}{hyp}$ $tan\theta = \frac{opp}{adj}$

$csc\theta = \frac{1}{sin\theta}$ $sec\theta = \frac{1}{cos\theta}$ $cot\theta = \frac{1}{tan\theta}$

$\tan(\theta)=\frac{\sin(\theta)}{\cos(\theta)}$

$sin(-\theta)=-sin\theta$

$cos(-\theta)=cos\theta$

$sin(2x)=2sin(x)cos(x)$

$cos(2x)=cos^2x-sin^2x$

$sin^2\theta+cos^2\theta=1$

$1+tan^2\theta=sec^2\theta$

$1+cot^2\theta=csc^2\theta$

Last update: September 16, 2021
Created: September 10, 2021