[Harold leaning back in his chair: Day 1209 of not using sin, cos or tan.]
I've been clean since 2002.
I've done that sort of thing before, too. But my experience is that I spend 20 minutes scratching out a formula that would make my physics profs proud, then make the cut, it comes out wildly off, I realize I would have been better off eyeballing it, and then I hide my failure with caulk