%% 
%%  A DANTE-Edition example
%% 
%%  Beispiel 02-06-2 auf Seite 50.
%% 
%%  Copyright (C) 2010 H. Voss
%% 
%%  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.
%% 
%%  See http://www.latex-project.org/lppl.txt for details.
%% 

%%Run also: >>  << 
% Show page(s) 1

\documentclass[]{article}
\pagestyle{empty}
\setlength\textwidth{122.59192pt}
\setlength\parindent{0pt}



\begin{document}
\renewcommand\arraystretch{2.5}
\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}