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## Homework Statement

If the mass per unit area of a surface is given by rho = x*y, find the mass

double integral over S of x*y dS if S is the part of the cylinder x^2 + z^2 = 9 which is in the first octant and contained within the cylinder x^2 + y^2 = 4.

## Homework Equations

Above.

## The Attempt at a Solution

I can visualize what the shape looks like, but I'm not sure how to define the bounds of integration based on the shape described.