I am familiar with the equation, but I am having trouble working out the entire answer. "Differentiate using the Product Rule": h(t)= Thanks!
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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