- #1

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**The attempt at a solution**

[tex]

\begin{equation*}

\begin{split}

\ -\ i\int\psi^* \frac{\partial{\psi}}{\partial x}= \\ -i(\psi^*\psi\ - \int\psi \frac{\partial\psi^*}{\partial x})\space\ (?)

\end{split}

\end{equation*}

[/tex]

I thought [itex] \psi^*\psi\ = \ constant\neq\ 0.[/itex] However, it vanishes in the correct proof.