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%%
%% An UIT Edition example
%%
%% Example 10-09-6 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
\usepackage{amsmath}
\StopShownPreambleCommands
\begin{document}
\begin{tabular}{|l|}\hline
$\tan\alpha=\dfrac{\sin\alpha}
{\cos\alpha} $\\
$\tan2\alpha=\dfrac{2\tan\alpha}
{1-\tan^2\alpha} $\\
$\tan3\alpha=\dfrac{3\tan\alpha-\tan^3\alpha}
{1-3\tan^2\alpha} $\\\hline
\end{tabular}
\end{document}
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