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LaTeX is a programming language that can be used for writing and typesetting documents. It is especially useful to write mathematical notation such as equations and formulae.  \section{How to use LaTeX to write mathematical notation}  There are three ways to present a mathematical expression in LaTeX--- LaTeX  \begin{enumerate}  \item \emph{inline} (in the middle of a text line)  \item as an \emph{equation}, on a separate dedicated line