\input{} in Formula

\documentclass{report}

\begin{document}

   My Big Formula:
   \begin{equation}
       \label{eq:1}
       \input{Formula}
   \end{equation}
   ...
   
   Blablabla
   
   ...

   My Big Formula, again:
   \[
       \input{Formula}
   \]
   
\end{document}