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%%
%% An UIT Edition example
%%
%% Example 04-01-4 on page 33.
%%
%% 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[]{exaarticle}
\pagestyle{empty}
\setlength\textwidth{375.57637pt}
\AtBeginDocument{\setlength\parindent{0pt}}
\setcounter{equation}{2}
\renewcommand\theequation{4.\arabic{equation}}
\StartShownPreambleCommands
\setlength\arraycolsep{1.4pt}
\StopShownPreambleCommands
\begin{document}
\begin{equation}
\left.
\begin{array}{r@{\hspace{.75em}}ccrr}
\textrm{a}) & y & = & d & \textrm{(constant)} \\[1pt]
\textrm{b}) & y & = & cx+d & \textrm{(linear)} \\
\textrm{c}) & y & = & bx^2+cx+d & \textrm{(quadratic)}\\
\textrm{d}) & y & = & ax^3+bx^2+cx+d & \textrm{(cubic)}
\end{array}
\right\} \textrm{polynomials}
\end{equation}
\end{document}
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