# The vertical asymptote of derivatives function

Let $f$ be function that has derivatives of order 2 and $\lim\limits_{x \to 0^+} f=+\infty$ and$f''$>0. prove that $\lim\limits_{x \to 0^+} f'=-\infty$

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## merged by Willie Wong♦Jul 20 '11 at 16:52

this question was merged with vertical asymptote of derivatives function because it is an exact duplicate of that question.