6. ifv{x, y) =2xy +3, fz)=uk, y) + iv(x, y) is analytic and further f(z = 0) =2+ 3i, then the function u(x, y) is (a) x*- y* + 2xy (b) x*-y*+y (c) x*-y+2 (d)x-y

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