latex formula code example

Example 1: equation latex

The mass-energy equivalence is described by the famous equation

\[E=mc^2\]

discovered in 1905 by Albert Einstein. 
In natural units ($c$ = 1), the formula expresses the identity

\begin{equation}
E=m
\end{equation}

Example 2: latex

Why there isn't Latex language option on Grepper?

Example 3: latex

git clone  https://github.com/latex3/latex2e.git