# ATAN

## Content

This function calculates the arctangent, that is, the angle whose tangent is the specified value.

## Syntax

`ATAN(value)`

## Arguments

For the argument, specify the tangent of the angle you want to return, which must be a value between –1 and 1.

## Remarks

The result angle is in radians between –PI/2 and PI/2. If you want to convert the result to degrees, multiply the result by 180/PI.

## Data Types

Accepts numeric data. Returns numeric data.

## Examples

`ATAN(B3)`

`ATAN(R3C2)`

`ATAN(1)` gives the result 0.7853981634