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JavaScript Math acos() Method

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  • Last Updated : 30 Dec, 2022
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The Javascript Math.acos( ) method is used to return the arccosine of a number in radians. The Math.acos() method returns a numeric value between 0 and pi radians. The Math acos() is a static method of Math, therefore, it is always used as Math.acos(), rather than as a method of a Math object created.

Math.acos(x)=arccos(x)=unique y, where y belongs to [0;pi] such that cos(y)=x

Syntax:

Math.acos(value)

Parameters: This function accepts a single parameter as mentioned above and described below:

  • Value: It is a number in radians whose arccosine you want to find.

Return value: The Math.acos() function returns the arccosine of the given number in radians. 

The below examples illustrate the Math acos( ) method in JavaScript:

Example 1: When 1 is passed as a parameter.

javascript




<script type="text/javascript">
    console.log("When 1 is passed as a parameter: "
                    + Math.acos(1));
</script>


Output:

When 1 is  passed as a parameter: 0

Example 2: When -1 is passed as a parameter.

javascript




<script type="text/javascript">
    console.log("When -1 is passed as a parameter: "
                    + Math.acos(-1));
</script>


Output:

When 1 is  passed as a parameter: 3.141592653589793

Example 3: When 0 is passed as a parameter.

javascript




<script type="text/javascript">
    console.log("When 0 is passed as a parameter: "
                    + Math.acos(0));
</script>


Output:

When 0 is  passed as a parameter: 1.5707963267948966

Example 4: When 0.5 is passed as a parameter.

javascript




<script type="text/javascript">
    console.log("When 0.5 is  passed as a parameter: " 
                    + Math.acos(0.5));
</script>


Output:

When 0.5 is  passed as a parameter: 1.0471975511965979

Example 5: When 2 is passed as a parameter.

javascript




<script type="text/javascript">
    console.log("When 2 is  passed as a parameter: " 
                   + Math.acos(2));
</script>


Output:

When 2 is  passed as a parameter: NaN

We have a complete list of Javascript Math Objects methods, to check those please go through this Javascript Math Object Complete reference article.

Supported Browsers:

  • Google Chrome 1 and above
  • Internet Explorer 3 and above
  • Firefox 1 and above
  • Opera 3 and above
  • Safari 1 and above

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