JavaScript Math atan( ) Method

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

• Example:
  
  

  
  
  

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

• Output:

  When 1 is  passed as a parameter: 0.7853981633974483

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

Math.atan(x)=arctan(x)=unique y
where y belongs to [-pi/2;pi/2]
such that tan(y)=x

Syntax:

Math.atan(value)

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

• x: which is a number in radians who arctangent you want to find.

Returns: The Math.atan() function returns the arctangent of the given number in radians.

Below examples illustrate the Math atan( ) method in JavaScript

• Example 1:

  Input : Math.atan(1)
  Output : 0.7853981633974483

• Example 2:

  Input : Math.atan(0)
  Output : 0

• Example 3:

  Input : Math.atan(-0)
  Output : -0

• Example 4:

  Input : Math.atan(Infinity)
  Output :  1.5707963267948966

• Example 5:

  Input : Math.atan(-Infinity)
  Output :  -1.5707963267948966

More example codes for the above method are as follows:

Program 1:

Output:

When 0 is  passed as a parameter: 0

Program 2:

Output:

When -0 is  passed as a parameter: 0

Program 3:

Output:

When Infinity is  passed as a parameter: 1.5707963267948966

Program 4:

Output:

When -Infinity is  passed as a parameter: -1.5707963267948966

Supported Browsers:

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