Math.acosh()
The Math.acosh()
function returns the hyperbolic
arc-cosine of a number, that is
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).
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
.
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));
};
Specifications
Specification |
---|
ECMAScript Language Specification # sec-math.acosh |
Browser compatibility
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