# arccos proc

Source: https://ref.dm-lang.org/proc/arccos

### Format
> `arccos(X)`

### Returns
> The inverse cosine of X in degrees.

```dm /arccos/
mob/verb/test()
   usr << arccos(0)        // 90
   usr << arccos(0.707107) // 45
   usr << arccos(1)        // 0
```

### See also
- [arcsin proc](https://ref.dm-lang.org/proc/arcsin.md)
- [arctan proc](https://ref.dm-lang.org/proc/arctan.md)
- [cos proc](https://ref.dm-lang.org/proc/cos.md)
- [turn proc](https://ref.dm-lang.org/proc/turn/index.md)