# Math.atan()

#### Availability

Flash Player 5. In Flash Player 4, the methods and properties of the Math object are emulated using approximations and may not be as accurate as the non-emulated math functions supported by Flash Player 5.

#### Usage

    Math.atan(x)

#### Parameters

`x` A number.

#### Returns

A number.

#### Description

Method; computes and returns the arc tangent for the number specified in the parameter `x`. The return value is between negative pi divided by 2, and positive pi divided by 2.