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+%% 
+%%  An UIT Edition example
+%% 
+%%  Example 10-09-5 on page 218.
+%% 
+%%  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{201.70511pt}
+\AtBeginDocument{\setlength\parindent{0pt}}
+\StartShownPreambleCommands
+
+\StopShownPreambleCommands
+\begin{document}
+\begin{tabular}{|p{5cm}|}\hline
+\[ \tan \alpha=
+   \frac{\sin\alpha}{\cos\alpha} \]\\
+\[ \tan2\alpha=
+   \frac{2\tan\alpha}{1-\tan^2\alpha}\]\\
+\[ \tan3\alpha=\frac{3\tan\alpha
+  -\tan^3\alpha}{1-3\tan^2\alpha} \]\\\hline
+\end{tabular}
+\end{document}