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Math Help - derrivative of an absolute value

  1. #1
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    derrivative of an absolute value

    y=ln l 2-x-5x^2 l how would i approach this?
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  2. #2
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    Joined
    Oct 2008
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    You can never take the log of a negative number.

    Suppose ln(-2) exists, then there exists some a such that e^a = -2, never true in the reals.

    Just use the chain rule, the absolute values shouldn't matter, correct me if I'm wrong.
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