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title: acos(n)
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canonical_url: https://developer.salesforce.com/docs/analytics/bi-dev-guide-saql/guide/bi-saql-functions-math-acos.html
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  - Analytics SAQL Developer Guide
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---

# acos(n)

Returns the arccosine value of radians value _n_. _n_ can be any real numeric value in the range of -1 \<= _n_ \<= 1. If `null` is passed as an argument, `acos()` returns `null`. This function can only be used in a `foreach` statement.

## Example

```nolang
q = foreach q generate acos(radians) as arccosine;
```