Ex.2) Evaluate zdV, where is the solid in the first octant E E bounded by the surface z= = 12xy and the planes y=x, x=1. [Sol.] 0.0 1.0 0.0 -0.5 1.0 y 0.8 06 04 02 GO 0.2 0.6 z = 12xy (graph, level curves) 10 y=x, x=1 z = 12.xy E

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