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use an appropriate coordinate system to find the volume of thegiven solid
Use both the cylindrical and the spherical coordinates to find
(a)the volume of the solid region below x2+y2+z2 =4 and z= x2 +y2.
(b) the total mass of the solid region in the first quadrant that is bounded above by z = x2 + y2, below by z = x2 + y2, and with the density function ĆĀ(x, y, z) = x2 + y2.