(adsbygoogle = window.adsbygoogle || []).push({}); Help on proofs!?! pleasee

Hi there, I was given these proofs to do for my quantum class.

proofs are the worst for me, I know it work and i have and idea how it starts which i wrote in the image but I can't seem to figure out the inbetweens. I've attach the images, if anyone can help me that would be great! thanks

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# Help on proofs? pleasee

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