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%%  A DANTE-Edition example
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%%  Example 02-06-1 on page 53.
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%%  Copyright (C) 2010 Herbert Voss
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%%  It may be distributed and/or modified under the conditions
%%  of the LaTeX Project Public License, either version 1.3
%%  of this license or (at your option) any later version.
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%%  See http://www.latex-project.org/lppl.txt for details.
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% Show page(s) 1
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\documentclass[]{article}
\pagestyle{empty}
\setlength\textwidth{153.70511pt}
\setlength\parindent{0pt}



\begin{document}
\begin{tabular}{c}\hline
$ f(x)=\frac{\sqrt{x^2-1}}{x^2+1}$            \\\hline
$ f(x)=\frac{\sqrt{x^2-1}}{x^2+\frac{1}{x^2}}$\\\hline
\end{tabular}
\end{document}