files/en-us/web/javascript/reference/global_objects/math/acosh/index.md

metadata

title: Math.acosh()
short-title: acosh()
slug: Web/JavaScript/Reference/Global_Objects/Math/acosh
page-type: javascript-static-method
browser-compat: javascript.builtins.Math.acosh
sidebar: jsref

The Math.acosh() static method returns the inverse hyperbolic cosine of a number. That is,

{{InteractiveExample("JavaScript Demo: Math.acosh()")}}

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

Syntax

Math.acosh(x)

Parameters

• x
  • : A number greater than or equal to 1.

Return value

The inverse hyperbolic cosine of x. If x is less than 1, returns {{jsxref("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(0); // NaN
Math.acosh(1); // 0
Math.acosh(2); // 1.3169578969248166
Math.acosh(Infinity); // Infinity

Specifications

{{Specifications}}

Browser compatibility

{{Compat}}

See also

• Polyfill of Math.acosh in core-js
• es-shims polyfill of Math.acosh
• {{jsxref("Math.asinh()")}}
• {{jsxref("Math.atanh()")}}
• {{jsxref("Math.cosh()")}}
• {{jsxref("Math.sinh()")}}
• {{jsxref("Math.tanh()")}}