# ATN()

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## Description

- This function returns the arc tangent of the given number or expression.
- The result is expressed in
**radians**. - The opposite is the TAN() function.

## Syntax

- ATN(Number)

## Hints

- Most mathematical operations in Just BASIC can be performed on Literal Numbers, Numeric Variables, or Numeric Expressions that consist of Literal Numbers, Numeric Variables, or both.
- There are 2 * pi radians in a full circle of 360 degrees. A formula to convert degrees to radians is: radians = degrees divided by 57.29577951.
- Some helpful functions to convert between radians and degrees are available at the ACS() function and ASN() function pages.

## Example

Print ATN(1) Print ATN(0.5) Print ATN(-0.2) Print ATN(-1/2) End

## Useful Procedures

' Place a useful function or sub using this keyword here

There is very useful function named atan2(y,x) function, which has its own page.