Spec / trig.mdon commit expand fields notes (6087721)
   1# Trigonometry
   2
   3## Unit circle
   4
   5For each angle, there is a corresponding point on the unit circle ($r=1$).
   6
   7- $\cos \theta$ is the $x$-coordinate of this point
   8- $\sin \theta$ is the $y$-coordinate
   9
  10![](https://cdn.edjin.com/upload/RESOURCE/IMAGE/103939.png)
  11
  12## Trigonometric ratios
  13
  14
  15## Cosine rule