# Math.cos()

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

## Syntax

`Math.cos(``x`)

### Parameters

`x`

- A number given in unit of radians.

### 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 2017 Draft (ECMA-262) The definition of 'Math.cos' in that specification. |
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

## License

© 2016 Mozilla Contributors

Licensed under the Creative Commons Attribution-ShareAlike License v2.5 or later.

https://developer.mozilla.org/en-us/docs/web/javascript/reference/global_objects/math/cos