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The only time I've ever used "u" with derivatives was like so:
Find the derivative of 1/(4-x^2)
u = x^2
du/dx = 2x
du = 2x dx
the problem then becomes du/(4-u)^2
Since u is x^2, and du is 2x, it becomes 2x/(4-x^2)^2.
In other words... u substitution. (I skipped a few steps, but you get the idea)
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Last edited by Stompy; 03-10-2005 at 12:36 PM..
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