# arccos

## Returns the inverse cosine of x.

**Syntax:**

arccos(x)

Argument |
Description |

x |
The angle (in radians) to return the inverse cosine of. |

**Returns:** Real

### Description

Returns the inverse cosine of x, in that if cos(val)=n,
arccos(n)=val, and the resulting number will be between pi and
0.

**NOTE:** This will only accept a number between -1 and 1
(anything else will throw an error).

**Example:**

val = arccos(0);

This will set val to pi/2.

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