OH RIGHT, the derivative. Well, here's the thing guys: it was actually two partial derivatives that came about because the problem required the use of the gradient (yeah, the symbol makes you feel super smart when you write it, I know). It wouldn't have been as bad if both variables hadn't been in both terms under negative radicals and both been involved in an expandable phrase (they call it that in music, and I figure physics and music are basically the same thing). Yeah, it got pretty hairy. Then there were 2 more problems to do.
Basically, this was all I did for 15 hours:

(I'm too tired to bother put it into the Photobucket and too tired to put up a direct link. Maybe I'll fix it tomorrow, but don't count on it. Count on not-it.)
-Dave
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