could someone please help with the proof of this,it's from JJ Sakurai book modern quantum mechanics
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$\begingroup$ Help in what way? $\endgroup$– AfterShaveCommented Oct 16, 2022 at 4:31
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$\begingroup$ Possible duplicates: physics.stackexchange.com/q/24116/2451 , physics.stackexchange.com/q/230041/2451 and links therein. $\endgroup$– Qmechanic ♦Commented Oct 16, 2022 at 5:52
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