%% 
%%  A DANTE-Edition example
%% 
%%  Example 02-15-1 on page 83.
%% 
%%  Copyright (C) 2010 Herbert 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.
%% 
%% 
%% ==== 
% Show page(s) 1
%% 
\documentclass[]{article}
\pagestyle{empty}
\setlength\textwidth{153.70511pt}
\setlength\parindent{0pt}

\usepackage{tabls}

\begin{document}
\begin{tabular}{c}\hline[10pt]
$ 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}\\[10pt]
%
\setlength\tablinesep{0pt}%   Standard-LaTeX
\setlength\arraylinesep{0pt}% Standard-LaTeX
\setlength\extrarulesep{0pt}% Standard-LaTeX
\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}