So, I have got another problem and can't figure out where is my mistake,
I have the following integral , I considered
and proceeded as follows: here, I considered that I can do some simplifications and
obtained that ,
but by evaluating it further and doing all the math I don't get the correct answer,
I saw that and thought that I can't do the simplifications since they are still and ,
so, I considered them separately, even though it seems wrong for me , but this also, as I expected, wrong,
please, can someone show me the mistake(s)?