thebookofshaders/glossary/cos.md

## Cos
Return the cosine of the parameter

### Declaration
```glsl
float cos(float angle)  
vec2 cos(vec2 angle)  
vec3 cos(vec3 angle)  
vec4 cos(vec4 angle)
```

### Parameters
```angle``` specify the quantity, in radians, of which to return the cosine.

### Description
```cos()``` returns the trigonometric sine of angle.

<div class="simpleFunction" data="y = cos(x); "></div>

### See Also
[acos](index.html#acos.md), [sin](index.html#sin.md), [asin](index.html#asin.md), [tan](index.html#tan.md), [atan](index.html#atan.md), [Chapter 05: Shaping Functions](../05/)