Question: ??????? (4) Prove that: If ( u(x, y) ) is a harmonic function and ( v(x, y) ) is its harmonic conjugate, then the function

??????? (4) Prove that: If $ u(x, y) $ is a harmonic function and $ v(x, y) $ is its harmonic conjugate, then the function $ w(x, y)=u(x, y) v(x, y) $ is harmonic. 2 answers

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