# Difference between revisions of "ApCoCoA-1:Fn.ArcCos"

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## Latest revision as of 10:00, 7 October 2020

This article is about a function from ApCoCoA-1. |

## Fn.ArcCos

Returns the arccosine of a given value.

### Syntax

Fn.ArcCos(X:RAT):RAT

### Description

This function returns the arccosine of `X` rounded to the current

global accuracy. The domain of this functions ranges between -1

and 1.

@param

*X*Value of which to compute the arccosine.@return The arccosine of

`X`rounded to the current global accuracy.

#### Example

Fn.SetAccuracy(20); R := Fn.ArcCos(1/2); Dec(R, 30); 1.04719755119659774615 -------------------------------