- #1

- 26

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[tex] [p^2, x] = p [p, x] + [p, x] p = \frac{2\hbar}{i} p [/tex]

I don't understand this. I know that [tex] p = -i \hbar \frac{\partial}{\partial x} [/tex], but I can't see how to get that expression...I just come up with something like [tex] x {\hbar}^2 \frac{{\partial}^2}{{\partial x}^2} [/tex] when I try multiplying it out.