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+%%
+%% The LaTeX Companion, 2ed (second printing August 2004)
+%%
+%% Example 8-2-7 on page 473.
+%%
+%% Copyright (C) 2004 Frank Mittelbach, Michel Goossens,
+%% Johannes Braams, David Carlisle, and Chris Rowley
+%%
+%% 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.
+%%
+
+\documentclass{ttctexamargin}
+\pagestyle{empty}
+\setcounter{page}{6}
+\setlength\textwidth{207.0pt}
+
+\StartShownPreambleCommands
+\usepackage{amsmath}
+\StopShownPreambleCommands
+\begin{document}
+\begin{equation}
+ \begin{split}
+ (a + b)^4
+ &= (a + b)^2 (a + b)^2 \\
+ &= (a^2 + 2ab + b^2)
+ (a^2 + 2ab + b^2) \\
+ &= a^4 + 4a^3b + 6a^2b^2 + 4ab^3 + b^4
+ \end{split}
+\end{equation}
+\end{document}