Definite integration yields a strange answer. (Solved)

[pwarmuth]

I do appreciate the help from the users in this forum. I don't want to come off sounding unappreciative of your time. I am a bit frustrated with this calculator at times, but I do believe it is superior. Perhaps later on in my math studies the distinction pointed out to me today will make more sense and will be identified as convention. For the moment though it's just another layer of confusion on an already difficult subject.