JavaScript Math asin( ) Method

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

• Example:

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

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

Output:

When -1 is  passed as a parameter: -1.5707963267948966

Program 2:

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

Output:

When 2 is  passed as a parameter: NaN

Program 3:

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

Output:

When 0.5 is  passed as a parameter: 0.5235987755982989

Supported Browsers:

• Google Chrome 1 and above
• Internet Explorer 12 and above
• Firefox 1 and above
• Opera 3 and above
• Safari 1 and above