JavaScript acos() method

Definition and usage

acos() The method returns the inverse cosine of a number, with a value of 0 to PI radians.

Note:If the parameter x If the value is outside the range of -1 to 1, this method will return NaN.

Tip:If the parameter x If the value is -1, then PI will be returned.

Example

Returns the inverse cosine of a number:

Math.acos(0.5);

Try it yourself

Syntax

Math.acos(x)

Parameter value

Parameter Description
x Required. It must be a number between -1.0 and 1.0.

Technical details

Return value: Numbers, from 0 to PI, if the value is outside the range of -1 to 1, it returns NaN.
JavaScript version: ECMAScript 1

Webbläsarstöd

Math.acos() Är ES1-funktioner (JavaScript 1999). Alla webbläsare stöder det fullt ut:

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Relaterade sidor

Lärobok:JavaScript matematik