Compute the following integrals: (a) * 2 COS E dr dy. (b) Evaluate the double integral [lnele v)/(z1v)dA where D is the triangle with vertices (0, 0), (1,0) and (0, 1). (c) Compute the volume of the ellipsoid bounded by the surface r + y + z2 - 1, a > 0.

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