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\begin{equation}

\frac{\partial }{\partial t}( \psi^{*} \psi ) = \frac{1}{i \hbar} \left(

\frac{\hbar^2 \psi \nabla^2 \psi^{*}}{2 m} - \frac{\hbar^2

\psi^{*} \nabla^2 \psi}{2 m} \right) \nonumber

\end{equation}