# ApCoCoA-1:Fn.ArcCos

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Revision as of 11:36, 4 May 2011 by S schuster (talk | contribs) (New page: <command> <title>Fn.ArcCos</title> <short_description>Returns the arccosine of a given value.</short_description> <syntax> Fn.ArcCos(X:RAT):RAT </syntax> <description> This function re...)

## 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 -------------------------------