Definite Integral Problem - Having trouble

I am sure this exact same one was looked at recently - is this a repeat post, I mean did you post it last time too?

Here is an answer that I posted a day or two ago.

I will admit that I have not looked at it seriously myself yet.  There may have been other answers, I am not sure about that :)

Doesn't really help a lot does it..

If you go back in time a bit you might find the other post. Maybe there was a better (more complete) answer but I do not recall one.

Definite Integral Problem - Having trouble

see same question and answer: https://web2.0calc.com/questions/something-mathematical-to-do#r5