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Homework Statement
I have been working on the problem below and I am stuck. I am stuck primarily because of the part where is says x=0. If x0, it should cancel everything out. The derivative of 0 is 0 so will cancel everything out I think, so I am not sure if that is the reasoning and the proof behind it.
Homework Equations
The Attempt at a Solution
I thought I should start this way, but I am not 100% sure.[/B]
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