JavaScript Math asin( ) Method

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

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

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  • Output:
    When 1 is  passed as a parameter: 1.5707963267948966

The Math.asin( ) method is used to return the arcsine of a number in radians. The Math.asin() method returns a numeric value between -pi/2 and pi/2 radians. The asin() is a static method of Math, therefore, it is always used as Math.asin(), rather than as a method of a Math object created.

Math.asin(x)=arcsin(x)=unique y
where y belongs to [-pi/2;pi/2]
such that sin(y)=x

Syntax:

Math.asin(value)

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



  • value: This parameter holds a number in radians who arcsine you want to find.

Returns: The Math.asin() method returns the arcsine of the given number in radians.

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

  • Example 1:
    Input : Math.asin(1)
    Output : 1.5707963267948966
  • Example 2:
    Input : Math.asin(-1)
    Output : -1.5707963267948966
  • Example 3:
    Input : Math.asin(2)
    Output : NaN
  • Example 4:
    Input : Math.asin(0.5)
    Output : 0.5235987755982989

More example codes for the above method are as follows:

Program 1:

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

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Output:

When -1 is  passed as a parameter: -1.5707963267948966

Program 2:

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

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Output:

When 2 is  passed as a parameter: NaN

Program 3:

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

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Output:

When 0.5 is  passed as a parameter: 0.5235987755982989

Supported Browsers:

  • Google Chrome
  • Internet Explorer
  • Firefox
  • Opera
  • Safari

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