From: Ralf Mueller <ralf.mueller@...>
Date: 2009-12-17T23:17:54+09:00
Subject: Re: BigDecimal and BigMath

Florian Weingarten wrote:
> Brandon Olivares <programmer2188@gmail.com> wrote:
>   
>> says you cannot pass a value for x that is greater than 1 or less than -1.
>> As far as I know, there is no such limit for the arctan. Also there is no
>>     
>
> Hi Brandon,
>
> [-1,1] is basically all you need, since
>
>  arctan(x) = sgn(x) * Pi/2 - arctan(1/x)
>
>
> Flo
>
>   
sure, but this is just a feature special to arctan. It might be used for 
implementation, but should not limit the set input values (i.e. its 
interface)

regards
ralf