# COS

Returns the cosine of an angle, where the angle is specified in radians.

## Syntax

`COS(angle)`

### Parameters

#### angle

An angle in radians. If the value is `null`, the function returns `null`.

## Examples

Calculates the cosine of the value in column `a` (which is set to 1.8 radians) and stores the result in a new column called `cos`:

```esql
ROW a=1.8
| EVAL cos=COS(a)
```