Definition and Usage The cos() method returns the cosine of a number. Syntax Math.cos(x) Parameter Description ...

## Definition and Usage

The cos() method returns the cosine of a number.

## Syntax

Parameter | Description |

x | Required. A number |

## Tips and Notes

**Note:** The cos() method returns a numeric value between -1 and 1, which represents the cosine of the angle.

## Example

In the following example we will return the cosine of different numbers:

<script type="text/javascript"> document.write(Math.cos(3) + "<br />");
document.write(Math.cos(-3) + "<br />");
document.write(Math.cos(0) + "<br />");
document.write(Math.cos(Math.PI) + "<br />");
document.write(Math.cos(2*Math.PI)); </script> |

The output of the code above will be:

-0.9899924966004454
-0.9899924966004454
1
-1
1 |