Math.cos()

Summary

The Math.cos() function returns the cosine of a number.

Syntax

Math.cos(x)

Parameters

x

A number given in unit of radians.

Description

The cos method returns a numeric value between -1 and 1, which represents the cosine of the angle.

Because cos is a static method of Math, you always use it as Math.cos(), rather than as a method of a Math object you created.

Examples

Example: Using Math.cos

Math.cos(0);           // 1
Math.cos(1);           // 0.5403023058681398

Math.cos(Math.PI);     // -1
Math.cos(2 * Math.PI); // 1

Specifications

Browser compatibility

See also

• The Math object it belongs to.