== Logarithmic differentiation == I`ll make a comment rather than ask a question, but maybe after that I`ll ask a question too, if I feel like it two minutes from now. and then one is taking the logarithm of the absolute value of a negative number. But there`s still the question of dy/dx at points where y = 0. I expect to think about that when ......
Found on http://en.wikipedia.org/wiki/Ahiazu-Mbaise
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