---
url: /cube-functions/acos.md
description: Returns the arc cosine of a number.
---

# ACOS

Returns the arc cosine of a number.

```js
ACOS(input_number)
```

#### Parameters

* `input_number` - The number input.

#### Examples

```js
ACOS(0.9)
```

**Result:** `0.451026812`