What did you get for the intersections? (Once you have these then they become the limits for your area integral).
The question is:
Please click the picture above.
I let x^2+y^2=a^2 be the vertical cylinder, and I tried to find
1)the intersections between x^2+y^2=a^2 and z=2xy
2)the intersections between x^2+y^2=a^2 and z=x^2+y^2
and then don't know how to do.
I need to show the two area is the same, but i don't know how to show.