I'm trying to calculate the following integral using Mathematica 18.104.22.168
This should be a simple problem; however, it took Mathematica a very long time to obtain the answer, which is 4. I asked a colleague to do it with Maple, the answer is obtained instantly. I thought may be this has something to do with the fact that Mathematica treats everthing as Complex value, so I rewrote the programm as
Unfortunately, it took Mathematica even more time to run this command. What's more unfortunate is that the obtained answer is wrong:
4 Abs[Sin[b]] Cot[b]
Does anybody know what's wrong here?