A function u = f(x, y) with continuous second partial derivatives satisfying Laplace's equation harmonic function. Calculate the indicated derivatives and determine if the function u(x, y) = x - x²y³ is harmonic. 12x²-³ dx² Incorrect -6x²y dy² Is the function u = x¹-x²y³ harmonic? yes no || = 0 is called a

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