# ATAN

## Content

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

## Syntax

`ATAN(value)`

## Arguments

[Required] For the argument, specify the tangent of the angle you want to return.

## 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.

## Examples

`ATAN(B3)`
`ATAN(R3C2)`
`ATAN(1)` gives the result 0.7853981634