Use cylindrical coordinates to calculate A = SSS xyz dV where D is the region in the first octant bounded by the planes z = 0, y = x, y = 4x, and the paraboloid z = 6-x²-y². Then the value of cos(2.A) is -0.315 0.329 • 0.975 -0.513 -0.681 0.560 0.431 0.397

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