Evaluate ff.dS, where (a) v = (xy, -x², x +z) and S is the part of the plane 2x + 2y + z = 6 included in the first octant; (b) v = (3y, 2x², z³) and S is the surface of the cylinder x² + y² = 1, 0 < z < 1.

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A: We can solve the given problem as follows:

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