I was looking at this proof of Ehrenfest's theorem http://farside.ph.utexas.edu/teaching/qmech/lectures/node35.html(adsbygoogle = window.adsbygoogle || []).push({});

I'm confused about equation 158. It looks like the first term under the integral sign in the first expression is vanishing to obtain the second expression but I don't know why it should vanish. Any ideas?

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# Not following one step for Ehrenfest's theorem

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