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Gib Z
Aug2-09, 06:58 AM
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P: 3,348
You evaluated dt incorrectly - the power rule only applies when the exponent of x is a constant - in this case it is not. To evaluate its derivative you must first convert it to a exponential form:

[tex] x^x = e^{x\ln x}[/tex]

Then use the chain and product rules.