ATAN Function

The ATAN function is one of the math and trigonometry functions. It is used to return the arctangent of a number.

The ATAN function syntax is:

ATAN(number)

where number is the tangent of the angle you wish to find, a numeric value entered manually or included into the cell you make reference to.

To apply the ATAN function,

1. select the cell where you wish to display the result,
2. click the Insert Function icon situated at the top toolbar,
   or right-click within a selected cell and select the Insert Function option from the menu,
   or click the icon situated at the formula bar,
3. select the Math and trigonometry function group from the list,
4. click the ATAN function,
5. enter the required argument,
6. press the Enter button.

The result will be displayed in the selected cell.