Example
Return the cosine of a number:
Math.cos(3);
The output of the code above will be:
-0.9899924966004454
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More "Try it Yourself" examples below.
Definition and Usage
The cos() method returns the cosine of a number.
Note: The cos() method returns a numeric value between -1 and 1, which represents the cosine of the angle.
Browser Support
| Method | |||||
|---|---|---|---|---|---|
| cos() | Yes | Yes | Yes | Yes | Yes |
Syntax
Math.cos(x)
Parameter Values
| Parameter | Description |
|---|---|
| x | Required. A number |
Technical Details
| Return Value: | A Number, from -1 to 1, representing the cosine of an angle, or NaN if the value is empty |
|---|---|
| JavaScript Version: | 1.0 |
More Examples
Example
Return the cosine PI and 2*PI:
var a = Math.cos(Math.PI);
var b = Math.cos(2 * Math.PI);
The result of a and b will be:
-1
1
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< JavaScript Math Object