> ## Documentation Index
> Fetch the complete documentation index at: https://www.integrate.io/docs/llms.txt
> Use this file to discover all available pages before exploring further.

# ETL: COS

> Calculate the trigonometric cosine of a numeric input value in radians. Use COS for geometric and mathematical computations in ETL pipelines.

## Description

Returns the trigonometric cosine of a number.

## Syntax

`COS(numeric_expression)`

## Examples

`COS(0)` returns 1.0.

## Return value datatype

Double

## Impact of null value

If input is null, returns null.