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%Not sponsored just a very good formula generator
https://latex.codecogs.com/eqneditor/editor.php
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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}
Write latex equation
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Inline math equation $ U = RI $
Block equation:
\[
U = RI
\]
or
$$
U = RI
$$
Numeroted block equation
\begin{equation}
U = RI
\label{eq:OhmLaw}
\end{equation}
Subequations (Xa, Xb, ):
\begin{subequations}
\label{eq:OhmLaws}
\begin{equation}
U = RI
\label{seq:OhmLaw}
\end{equation}
\begin{equation}
U = ZI
\label{seq:OhmLawImpedance}
\end{equation}
\end{equations}