For what values of the constants A and B is the polynomial function Ax 2. 2 4 f(x, у) %3D Ах + Bxy + 5y* harmonic in the whole xy-plane? 4 2.2 4 f(x, y) = Ax* + Bxy + 5y* is harmonic in the xy-plane if У + %3D A = and B =

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