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%%
%% The LaTeX Companion, 3ed
%%
%% Example 11-7-22 on page II-207 in "Color in formulas".
%%
%% Copyright (C) 2022 Frank Mittelbach
%%
%% It may be distributed and/or modified under the conditions
%% of the LaTeX Project Public License, either version 1.3c
%% of this license or (at your option) any later version.
%%
%% See https://www.latex-project.org/lppl.txt for details.
%%
\documentclass{tlc3examargin}
\pagestyle{empty}
\setcounter{page}{6}
\setlength\textwidth{123.0pt}
% Shorten the vertical size of the example ...
\AtBeginDocument{%
\setlength\abovedisplayskip{.5\abovedisplayskip}%
\setlength\belowdisplayskip{.2\belowdisplayskip}%
\setlength\baselineskip{8pt}% % <- fake for book
}
%StartShownPreambleCommands
\usepackage{amsmath,color}
%StopShownPreambleCommands
\begin{document}
What is \textcolor{blue}{$(a+b)(a-b)$}?
\begin{align*}
\color{blue} (a+b)^2 &= a^2 + 2ab + b^2 \\
(a-b)^2 &= a^2 \color{blue}- 2ab + b^2 \end{align*}
\end{document}
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