User:PAStheLoD/sandbox

$$ \frac{\partial}{ \partial t } |\mathbf \Psi|^2 = \frac{\partial}{\partial t} (\mathbf \Psi^*\mathbf \Psi) = \mathbf \Psi^* \frac{\partial \mathbf \Psi}{\partial t} + \frac{\partial \mathbf \Psi^*}{\partial t} \mathbf \Psi $$