Baseline Widely available
The Math.acosh() static method returns the inverse hyperbolic cosine of a number. That is,
console.log(Math.acosh(0.999999999999));
// Expected output: NaN
console.log(Math.acosh(1));
// Expected output: 0
console.log(Math.acosh(2));
// Expected output: 1.3169578969248166
console.log(Math.acosh(2.5));
// Expected output: 1.566799236972411
x
A number greater than or equal to 1.
The inverse hyperbolic cosine of x. If x is less than 1, returns NaN.
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(0); // NaN
Math.acosh(1); // 0
Math.acosh(2); // 1.3169578969248166
Math.acosh(Infinity); // Infinity
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