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%%  Ein Beispiel der DANTE-Edition
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%%  Beispiel 06-03-33 auf Seite 235.
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%%  Copyright (C) 2016 Herbert Voss
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%%  It may be distributed and/or modified under the conditions
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%%  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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\documentclass[]{exaarticle}
\pagestyle{empty}
\setlength\textwidth{121.16928pt}
\setlength\parindent{0pt}
%StartShownPreambleCommands

%StopShownPreambleCommands
\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}