Problem 6 from Cohen-Tannoudji's quantum mechanics

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Homework Statement



This problem is Problem 6 in Chapter X, Cohen-Tannoudji's quantum mechanics. I can solve the first 3 problems, but not the rest two. I need some hints! Thank you very much!
 
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Not everyone has access to this textbook. Could you write out the questions please?
 
Thank you, Clever-Name and everybody. I suddenly find the solution. Thank you!