newcommand latex code example

Example 1: new command - latex

\newcommand{\reverseconcat}[3]{\bfseries#3#2#1} % version 2

Example 2: newcommand latex

If you use a command multiple times create e shortcut, like for example:
...
\newcommand{\be}{\begin{equation}}
\newcommand{\ee}{\end{equation}}
...
\begin{document}
...