JavaScript Math atan( ) Method

• Last Updated : 07 Jul, 2020

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

• Example:

• 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: