Math.cos()
Baseline Widely available
This feature is well established and works across many devices and browser versions. It’s been available across browsers since July 2015.
The Math.cos()
static method returns the cosine of a number in radians.
Try it
function getCircleX(radians, radius) {
return Math.cos(radians) * radius;
}
console.log(getCircleX(1, 10));
// Expected output: 5.403023058681398
console.log(getCircleX(2, 10));
// Expected output: -4.161468365471424
console.log(getCircleX(Math.PI, 10));
// Expected output: -10
Syntax
js
Math.cos(x)
Parameters
x
-
A number representing an angle in radians.
Return value
Description
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()
js
Math.cos(-Infinity); // NaN
Math.cos(-0); // 1
Math.cos(0); // 1
Math.cos(1); // 0.5403023058681398
Math.cos(Math.PI); // -1
Math.cos(2 * Math.PI); // 1
Math.cos(Infinity); // NaN
Specifications
Specification |
---|
ECMAScript® 2025 Language Specification # sec-math.cos |
Browser compatibility
Report problems with this compatibility data on GitHubdesktop | mobile | server | ||||||||||||
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cos |
Legend
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- Full support
- Full support
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