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- Thread starter raul_l
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arildno

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The nasty part of this is, of course the logarithm part, and possibly rearranging the expression you get afterwards.

For starters:

What is the derivative wrt. x of [itex]\sqrt{1+x^{2}}[/itex]?

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raul_l

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[tex] -\frac{x}{\sqrt{1+x^2}} [/tex] ?

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arildno

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Why the minus sign??

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