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

Specification Status Comment
ECMAScript 1st Edition. Implemented in JavaScript 1.0 Standard Initial definition.
ECMAScript Language Specification 5.1th Edition (ECMA-262) Standard  
ECMAScript Language Specification 6th Edition (ECMA-262) Draft  

Browser compatibility

Feature Chrome Firefox (Gecko) Internet Explorer Opera Safari
Basic support (Yes) (Yes) (Yes) (Yes) (Yes)
Feature Android Chrome for Android Firefox Mobile (Gecko) IE Mobile Opera Mobile Safari Mobile
Basic support (Yes) (Yes) (Yes) (Yes) (Yes) (Yes)

See also

  • The Math object it belongs to.

Document Tags and Contributors

Contributors to this page: evilpie, Sheppy, sransara, Marcoos, fscholz, ethertank, Mgjbot, Maian, Dria, Kyodev
Last updated by: fscholz,