From: Mathieu Bouchard <matju@...>
Date: 2001-12-06T02:38:41+09:00
Subject: [ruby-talk:27573] Re: Help! acos, asin - where?


On Thu, 6 Dec 2001, Thomas R. Corbin wrote:

> I found the Math::atan2 (why 2?) method, but haven't figured out how to do
> acos or asin.   I'm sure I'm missing something simple, but I'm stumped.
> 
>         Thanks for your help,
>         Tom Corbin
> 

def Math.asin x; atan2 x,sqrt(1-x*x) end
def Math.acos x; atan2 sqrt(1-x*x),x end

________________________________________________________________
Mathieu Bouchard                   http://hostname.2y.net/~matju