> For the complete documentation index, see [llms.txt](https://mariadb.com/docs/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://mariadb.com/docs/server/reference/sql-functions/numeric-functions/cos.md).

# COS

## Syntax

```bnf
COS(X)
```

## Description

Returns the cosine of X, where X is given in radians.

## Examples

```sql
SELECT COS(PI());
+-----------+
| COS(PI()) |
+-----------+
|        -1 |
+-----------+
```

<sub>*This page is licensed: GPLv2, originally from*</sub> [<sub>*fill\_help\_tables.sql*</sub>](https://github.com/MariaDB/server/blob/main/scripts/fill_help_tables.sql)

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