So I am trying to understand and solve the problem mentioned in the title.I found a solution online:

https://physics.bgu.ac.il/COURSES/QuantumMechCohen/ExercisesPool/EXERCISES/ex_9011_sol_Y09.pdf

The problem is, I can't understand this step:

https://ibb.co/H4pmtyz

I relly can't find out how the two expontential terms in the parenthesis show up. Any help greatly appreciated.

https://physics.bgu.ac.il/COURSES/QuantumMechCohen/ExercisesPool/EXERCISES/ex_9011_sol_Y09.pdf

The problem is, I can't understand this step:

https://ibb.co/H4pmtyz

I relly can't find out how the two expontential terms in the parenthesis show up. Any help greatly appreciated.

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