JavaScript Math.acos()
Examples
let x = Math.acos(-1);
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let x = Math.acos(0);
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let x = Math.acos(1);
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Description
The Math.acos() method returns the arccosine (in radians) of a number.
The Math.acos() method returns a value value between 0 and PI.
The Math.acos() method expects a parameter in the range -1 to 1.
Math.acos(-1) returns PI.
Math.acos(0) returns PI/2.
Math.acos(1) returns 0.
JavaScript Sine and Cosine Methods:
The Math.sin() MethodThe Math.sinh() Method
The Math.asin() Method
The Math.asinh() Method
The Math.cos() Method
The Math.cosh() Method
The Math.acos() Method
The Math.acosh() Method
Syntax
Math.acos(x)
| Parameter | Description |
| x | Required. A number. |
Return Value
| Type | Description |
| Number | 0 to PI.NaN if the parameter is outside the range of -1 to 1 or not numeric. |
Browser Support
Math.acos() is an ECMAScript1 (ES1) feature.
ES1 (JavaScript 1997) is fully supported in all browsers:
| Chrome | Edge | Firefox | Safari | Opera | IE |
| Yes | Yes | Yes | Yes | Yes | Yes |
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