# ApCoCoA-1:Fn.ArcTanN

From ApCoCoAWiki

## Fn.ArcTanN

Returns the arctangent of a given value with a given accuracy.

### Syntax

Fn.ArcTanN(Val:RAT,Acc:INT):RAT

### Description

This function returns the arctangent of `Val` rounded to the given

accuracy `Acc`.

@param

*Val*Value of which to compute the arctangent.@param

*Acc*The desired accuracy.@return The arctangent of

`Val`rounded to the given accuracy`Acc`.

#### Example

R := Fn.ArcTanN(1/2, 30); Dec(R, 40); 0.463647609000806116214256231461 -------------------------------