Hey,
I've been stuck on this problem for quite some time:
J = ∫0 ->4 ∫ sqrt(x) -> 2 (1 + y^2 * cos(x * sqrt(y))) dydx
The cos (x * sqrt(y)) is the one causing trouble. I can't seem to find a way to integrate this. I even tried to turn it to polar coordinates but nothing seems to work.
What am I doing wrong? Could someone point me in the right direction?
Another thing I don't understand with multiple integrals : How do you know if it represents a Volume?
Thanks in advance.
PS: Sorry for my english, it's not my native language.