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Vertical Tangent

A function $f(x)$ has a vertical tangent line at $x_0$ if $f$ is continuous at $x_0$ and

\begin{displaymath}
\lim_{x\to x_0} f'(x) = \pm\infty.
\end{displaymath}




© 1996-9 Eric W. Weisstein
1999-05-26