---
tag: 0CWDVN132S
kind: concept
name: Arccosine
msc: [33B10]
sources:
  - url: https://en.wikipedia.org/wiki/Inverse_trigonometric_functions
    locator: Principal values
---

## Summary

The arccosine is the inverse of the cosine function restricted to $[0, \pi]$. It is defined on $[-1, 1]$. The node [[arccosine|0RDP2HEFEW]] gives the precise definition.