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![[Post New]](/templates/default/images/icon_minipost_new.gif) 27 Mar 2008 07:42:05 IST
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logIxI
when x is positive
y = logx
therefore
dy/dx = 1/x
when x is negative
y = -logx
dy/dx = -1/x
combining the two answers
we get dy/dx = 1/IxI
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