Need help A problem with Cohen Tannoudji's book

[qinglong.1397]

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!

 

[Clever-Name]

Not everyone has access to this textbook. Could you write out the questions please?

 

[qinglong.1397]

Thank you, Clever-Name and everybody. I suddenly find the solution. Thank you!