multiline equation in latex code example

Example 1: multi line comments latex

\usepackage{verbatim}
%^that goes at the very top

\begin{comment}
stuff commented out here
\end{comment}

Example 2: latex align equation

\begin{align}
(a+b)^2 &= (a+b)(a+b) \\
        &= a^2+2ab+b^2 
\end{align}