[Chapter 21] Reference: Math.atan()
Author: David Flanagan
Date: Fri Aug 29 11:17:39 1997

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| Chapter 21 JavaScript Reference |

# Math.atan() Function

## Name

Math.atan() Function---compute an arc tangent

## Availability

Navigator 2.0, Internet Explorer 3.0

## Synopsis

    Math.atan(x)

### Arguments

`x`

  Any number or numeric expression.

### Returns

The arc tangent, in radians, of the specified value `x`.

## Description

`Math.atan()` computes and returns the arc tangent, or inverse tangent, of its argument. The return value is between -pi/2 and pi/2 radians.

## See Also

"Math", "Math.acos()", "Math.asin()", "Math.tan()"

Math.asin() |  | Math.atan2()