I am familiar with the equation, but I am having trouble working out the entire answer.
"Differentiate using the Product Rule":
Last edited by mr fantastic; Sep 30th 2009 at 10:01 PM.
Reason: Formalised the edit made by the OP
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Originally Posted by cynlix whoops, sorry. I meant product rule.
This is what I have so far...
= Mr F says: This should either be or . Everything that followed will be wrong.
[snip] Putting 1 for the derivative of was a particularly bad mistake.
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