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+%%
+%% An UIT Edition example
+%%
+%% Example 10-09-7 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{177.70511pt}
+\AtBeginDocument{\setlength\parindent{0pt}}
+\StartShownPreambleCommands
+\usepackage{amsmath}
+\renewcommand\arraystretch{2.2}
+\StopShownPreambleCommands
+\begin{document}
+\begin{tabular}{|l|}\hline
+$\tan\alpha=\dfrac{\sin\alpha}
+ {\cos\alpha} $\\
+$\tan2\alpha=\dfrac{2\tan\alpha}
+ {1-\tan^2\alpha} $\\
+\rule[-3ex]{0pt}{6ex}%
+$\tan3\alpha=\dfrac{3\tan\alpha-\tan^3\alpha}
+ {1-3\tan^2\alpha} $\\\hline
+\end{tabular}
+\end{document}