From: "J. Cooper" <nefigah@...>
Date: 2008-02-15T16:49:23+09:00
Subject: Re: Making an object follow another object - FAIL!

My trig class was a long time ago, but from what I recall certain 
trigonometric functions are only positive in certain quadrants (angle 
ranges). This seems to touch on that:
http://www.intmath.com/Trigonometric-functions/5_Signs-of-trigonometric-functions.php
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