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JavaScript Math acos( ) Method

  • Last Updated : 27 May, 2021

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
  • Internet Explorer
  • Firefox
  • Opera
  • Safari


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