# tan

(PHP 4, PHP 5)

tan — Tangent

### Description

float tan ( float `$arg` )

tan() returns the tangent of the `arg` parameter. The `arg` parameter is in radians.

### Parameters

`arg`

  The argument to process in radians

### Return Values

The tangent of `arg`

### Examples

Example#1 tan() example

`<?php
echo tan(M_PI_4); // 1
?>`

### See Also

- atan()
- atan2()
- sin()
- cos()
- tanh()
- deg2rad()