Math.cos()

You’re reading the English version of this content since no translation exists yet for this locale. Help us translate this article!

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 Status Comment
ECMAScript 1st Edition (ECMA-262) Standard Initial definition. Implemented in JavaScript 1.0.
ECMAScript 5.1 (ECMA-262)
The definition of 'Math.cos' in that specification.
Standard
ECMAScript 2015 (6th Edition, ECMA-262)
The definition of 'Math.cos' in that specification.
Standard
ECMAScript Latest Draft (ECMA-262)
The definition of 'Math.cos' in that specification.
Draft

Browser compatibility

Update compatibility data on GitHub
Desktop Mobile Server Chrome Edge Firefox Internet Explorer Opera Safari Android webview Chrome for Android Firefox for Android Opera for Android Chrome Full support 1 Edge Full support 12 Firefox Full support 1 IE Full support 3 Opera Full support Yes Safari Full support Yes WebView Android Full support 1 Chrome Android Full support 18 Firefox Android Full support 4 Opera Android Full support Yes Safari iOS Full support Yes Samsung Internet Android Full support 1.0 nodejs Full support Yes

Full support
Full support