---
title: math.Acos
description: Returns the arccosine, in radians, of the given number.
categories: []
keywords: []
params:
  functions_and_methods:
    aliases: []
    returnType: float64
    signatures: [math.Acos VALUE]
---

{{< new-in 0.130.0 />}}

```go-html-template
{{ math.Acos 1 }} → 0
```