> ## 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: TAN

> Calculate the trigonometric tangent of a numeric input in radians. Use TAN for geometric and mathematical computations in ETL pipeline expressions.

## Description

Returns the trigonometric tangent of a number.

## Syntax

`TAN(numeric_expression)`

## Examples

`TAN(0)` returns 0.

## Return value datatype

Double

## Impact of null value

If input is null, returns null.