I still don't know the math symbols, so please bear with me!
I have the big S thing over sin(2X)*DX, its antidifferentiation is -(cos(2X))/2 + C
I have completely lost where that over 2 comes from. Wolfram alpha is not helpful. I realize that somewhere we pull a 1/2 out in front of everything, but I don't know where.
Thanks, I hope I'm making SOME sense.