Булат, поясни твой вопрос. Каждая Problem начинается с раздела Solution, т.е. задача уже решена! Тебе нужно проверить это решение или что-то еще? Я не знаю квантовой механики и, возможно, не улавливаю какой-то смысл.

I've downloaded the book and written the Problem 45. 

To be honest, I am far from Quantum mechanics, but can try to undestand the problem as a mathematical task. As I understood, Problem 45 is not a problem requred to be solved. Description of the problem has no unsolved questions. Maybe, you intend to verify implications entering in the description of the problem. Please, clarify your question.

@Preben Alsholm 

Thank you, but for some reasons it is essential to use output = Array option. 

Thank you for exlanation, I realized, that equation has no enough smoothness.

Булат, размести ссылку, откуда можно загрузить странички в нормальном разрешении.

На твоих снимках очень плохо видны детали.

И постарайся перейти на более высокую версию Maple.

Thank you. It works.

@Zihan 

Yes, see the source, please.

Exported LaTeX file has the separators \\ for separating the lines.

I only inserted the enviroment array and the formula gets ready!

@Preben Alsholm 

I tested a couple of example. You are right!

evalf(Int) return the same values each time.

So my problem is solved. Regards.

@Markiyan Hirnyk 

I figured out.

@Preben Alsholm 

Regarding symbolic calculation of int, look here:

evalf(int) does numerical integration!

@Markiyan Hirnyk 

Thank you, I'll try to insight into the problem.

@Markiyan Hirnyk 

I perfectly undestand, that the different values appear due to roundoff errors. But why are the errors different? If an algorithm is deterministic, the errors should be equal.

@Carl Love 

You are right. But in some cases text files can have significantly different lengths of strings. Use of extra spaces in this case will drastically increase the file size and, hence, the speed of processing.

@Carl Love 

Proposed solution is obvious, but I would like to find more elegant way.......

@Carl Love 

Thanks, this is a solution I was looking for.

@Markiyan Hirnyk 

Usually I use plots[display] for this purpose, но это не очень удобно.