v(x,y) = 3x² y - 2xy - y³ Which of the following is the Real part of the analytical complex function f(Z) =u(x,y)+iv(x,x) given the imaginary part? u(x,y) = x³ - 3 x y² b) u(x, y) = x³ + x - 3x y? и(х, у) — х3 — х - 3ху? d) u(x,y) = x³ + x? - 3x y? - y? u(x, y) = x³ - x² - 3x y² + y²

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