# ACOS

## Content

This function calculates the arccosine, that is, the angle whose cosine is the specified value.

## Syntax

`ACOS(value)`

## Arguments

[Required] Specifies the cosine of the angle you want to return, which must be a value between –1 and 1.

## Remarks

The result angle is in radians between 0 (zero) and PI (pi). If you want to convert the result to degrees, multiply the result by 180/PI.

## Examples

`ACOS(B3)`
`ACOS(R3C2)`
`ACOS(0.5)` gives the result 1.0471975512