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Javascript Math - acos Method


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Description:

This method returns the arccosine in radians of a number. The acos method returns a numeric value between 0 and pi radians for x between -1 and 1. If the value of number is outside this range, it returns NaN.

Syntax:

Math.acos( x ) ;

Here is the detail of parameters:

  • x : A number.

Return Value:

Returns the arccosine in radians of a number.

Example:

<html>
<head>
<title>JavaScript Math acos() Method</title>
</head>
<body>
<script type="text/javascript">

var value = Math.acos(-1);
document.write("First Test Value : " + value ); 
  
var value = Math.acos(null);
document.write("<br />Second Test Value : " + value ); 

var value = Math.acos(30);
document.write("<br />Third Test Value : " + value ); 

var value = Math.acos("string");
document.write("<br />Fourth Test Value : " + value ); 
</script>
</body>
</html>

This will produce following result:

First Test Value : 3.141592653589793
Second Test Value : 1.5707963267948965
Third Test Value : NaN
Fourth Test Value : NaN 

To understand it in better way you can Try it yourself.



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