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1. The problem statement, all variables and given/known data

I've got two formulae here and I'm not sure how you get from the first to the second:

[tex]\textbf{j}(\textbf{x},t) = Re[\Psi^{*}(x,t)(-i/m)\nabla\Psi(x,t)][/tex]

[tex]= \frac{-i}{2m}[\Psi^{*}(\nabla\Psi) - (\nabla\Psi^{*})\Psi][/tex]

Can anyone suggest a relationship I need to bridge the gap? Thanks.

2. Relevant equations

3. The attempt at a solution

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# Homework Help: Relativistc probability current

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