The Math.acosh()
function returns the hyperbolic arc-cosine of a number, that is
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Syntax
Math.acosh(x)
Parameters
- x
- A number.
Return value
The hyperbolic arc-cosine of the given number. If the number is less than 1, NaN
.
Description
Because acosh()
is a static method of Math
, you always use it as Math.acosh()
, rather than as a method of a Math
object you created (Math
is no constructor).
Polyfill
For all , we have and so this can be emulated with the following function:
Math.acosh = Math.acosh || function(x) { return Math.log(x + Math.sqrt(x * x - 1)); };
Examples
Using Math.acosh()
Math.acosh(-1); // NaN Math.acosh(0); // NaN Math.acosh(0.5); // NaN Math.acosh(1); // 0 Math.acosh(2); // 1.3169578969248166
For values less than 1 Math.acosh()
returns NaN
.
Specifications
Specification |
---|
ECMAScript (ECMA-262) The definition of 'Math.acosh' in that specification. |
Browser compatibility
The compatibility table in this page is generated from structured data. If you'd like to contribute to the data, please check out https://github.com/mdn/browser-compat-data and send us a pull request.
Desktop | Mobile | Server | |||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|
acosh | Chrome Full support 38 | Edge Full support 12 | Firefox Full support 25 | IE No support No | Opera Full support 25 | Safari Full support 8 | WebView Android Full support 38 | Chrome Android Full support 38 | Firefox Android Full support 25 | Opera Android Full support 25 | Safari iOS Full support 8 | Samsung Internet Android Full support 3.0 | nodejs Full support 0.12 |
Legend
- Full support
- Full support
- No support
- No support