Hi,
The problem is in the attached PDF file.
Thanks.
I'm not sure where this will go, but lets start by expanding the integrals, as and are independent:
and:
Now we can observe that the region over which we are integrating in the first integral is the part of the x-y plane below and that in the second integral is that part of the plane above the same line.
Quite where to go from here I don't know
RonL