Math.cos()

The Math.cos() static function returns the cosine of the specified angle, which must be specified in radians. This value is length adjacent length hypotenuse .

Syntax

Math.cos(x)

Parameters

x
The angle in radians for which to return the cosine.

Return value

The cosine of the given number.

Description

The Math.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 (Math is not a constructor).

Examples

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
ECMAScript Latest Draft (ECMA-262)
The definition of 'Math.cos' in that specification.

Browser compatibility

Update compatibility data on GitHub
DesktopMobileServer
ChromeEdgeFirefoxInternet ExplorerOperaSafariAndroid webviewChrome for AndroidFirefox for AndroidOpera for AndroidSafari on iOSSamsung InternetNode.js
cosChrome Full support 1Edge Full support 12Firefox Full support 1IE Full support 3Opera Full support 3Safari Full support 1WebView Android Full support 1Chrome Android Full support 18Firefox Android Full support 4Opera Android Full support 10.1Safari iOS Full support 1Samsung Internet Android Full support 1.0nodejs Full support Yes

Legend

Full support  
Full support

See also