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+%%
+%% An UIT Edition example
+%%
+%% Example 06-03-2 on page 89.
+%%
+%% 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{375.57637pt}
+\AtBeginDocument{\setlength\parindent{0pt}}
+\StartShownPreambleCommands
+\usepackage{amsmath}
+\StopShownPreambleCommands
+\begin{document}
+\begin{gather*}
+ A = \lim _{n\rightarrow \infty }\Delta x\left( a^{2}+\left( a^{2}+2a\Delta x+\left(
+ \Delta x\right) ^{2}\right)\right.\\
+ +\left( a^{2}+2\times 2a\Delta x+2^{2}\left( \Delta x\right) ^{2}\right)
+ +\left( a^{2}+2\times 3a\Delta x+3^{2}\left( \Delta x\right) ^{2}\right)\\
+ + \ldots\\
+ \left.+\left( a^{2}+2\times (n-1)a\Delta x +(n-1)^{2}
+ \left( \Delta x\right) ^{2}\right) \right)\\
+ = \frac{1}{3}\left( b^{3}-a^{3}\right)
+\end{gather*}
+\end{document}