Quote by LCKurtz
You are having problems integrating that? Look up u substitutions and the double angle formula for [itex]\sin^2\theta\hbox{ and }\cos^2\theta[/itex].

Well not so much having problems integrating it, but because just want to know if I've done anything wrong so far?
Besides that, the original question ask to find the flux out of the bounded region, and here I'm finding the flux of S1 alone, would I then need to find the flux of S2 also?