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%%
%% Der LaTeX-Begleiter, zweite Auflage (September 2005)
%%
%% Beispiel 1-3-4 von Seite 14.
%%
%% Copyright (C) 2005 Frank Mittelbach, Michel Goossens,
%%    Johannes Braams, David Carlisle, and Chris Rowley
%%
%% Uebersetzung: Copyright (C) 2005 Claudia Krysztofiak,
%%    Rebecca Stiels und Frank Mittelbach
%%
%% 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{lb2examargin}
\pagestyle{empty}
\setcounter{page}{6}
\setlength\textwidth{183.0pt}

\StartShownPreambleCommands
\usepackage[tbtags]{amsmath}
\StopShownPreambleCommands
\begin{document}
\begin{equation}
 \begin{split}
  (a + b)^3 &= (a + b) (a + b)^2        \\
            &= (a + b)(a^2 + 2ab + b^2) \\
            &= a^3 + 3a^2b + 3ab^2 + b^3
 \end{split}
\end{equation}
\end{document}