Definition: Returns the arctangent of a number.
Granted, this one doesn't come up too terribly often in system administration scripts. Nevertheless, if you ever doneed to calculate the arctangent of an angle you can do so using the System.Mathclass and the Atan method. This command assigns the arctangent of a 90 degree angle to the variable $a:
When you run this command and then echo back the value of $ a youshould get the following: