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JavaScript Math acos( ) Method

  • Last Updated : 26 Jan, 2022

Below is the example of the Math acos( ) Method.

  • Example:

    <script type="text/javascript">
             document.write("When 1 is  passed as a parameter: " 
                            + Math.acos(1));
  • Output:
    When 1 is  passed as a parameter: 0

The 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



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

  • value which is a number in radians who arccosine you want to find.

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

Below examples illustrate the Math acos( ) method in JavaScript:

  • Example 1:
    Input  : Math.acos(1)
    Output : 0
  • Example 2:
    Input  : Math.acos(-1)
    Output : 3.141592653589793
  • Example 3:
    Input : Math.acos(0)
    Output: 1.5707963267948966

More example codes for the above method are as follows:

Program 1:


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


When 1 is  passed as a parameter: 3.141592653589793

Program 2:


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


When 0 is  passed as a parameter: 1.5707963267948966

Program 3:


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


When 0.5 is  passed as a parameter: 1.0471975511965979

Program 4:


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


When 2 is  passed as a parameter: NaN

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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