) Let W1 be the solid half-cone bounded by z = Vx2 + y2, z = 4 and the yz-plane with x > 0, and let Let W2 be the solid half-cone Vx2 + y?, z = 5 and the xz- bounded by z = plane with y > 0. For each of the following, decide (without calculating its value) whether the integral is positive, negative, or zero. (a) Jw, yz dV is ? W1 .2 (b) Sw, Væ² + y² dV is (c) Sw, xy? dV is ? >

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