# Math.cos()

#### Availability

Flash Player 5. In the 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 the Flash Player 5.

#### Usage

    Math.cos(x)

#### Parameters

`x` An angle measured in radians.

#### Returns

A number.

#### Description

Method; returns the cosine (a value from -1.0 to 1.0) of the angle specified by the parameter `x`. The angle `x` must be specified in radians. Use the information outlined in the introduction to the Math object to calculate a radian.