The Math.acosh()
function returns the hyperbolic arc-cosine of a number, that is
Math.acosh(x)
x
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).
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.
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)); };
Created by Mozilla Contributors, license: CC-BY-SA 2.5