A lamina with density (x; y) = 10y (x 2 + y 2 ), occupies the region inside the circle x 2 + y 2 = 2x and outside the circle x 2 +y 2 = 1, inside the Örst octant. Find the mass of the lamina. (a) Set us the integral, in rectangular (cartesian) coordinates, of the mass of this lamina. Do not integrate. (b) Set up the integral from (a) in terms of polar coordinates. Do not integrate. (c) Integrate the easier of (a) and (b)