# JavaScript Math atan( ) Method

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:

• Internet Explorer
• Firefox
• Opera
• Safari My Personal Notes arrow_drop_up If you like GeeksforGeeks and would like to contribute, you can also write an article using contribute.geeksforgeeks.org or mail your article to contribute@geeksforgeeks.org. See your article appearing on the GeeksforGeeks main page and help other Geeks.

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