af af Әх' ду f(x, y) = 3(x2 + y2) log(x2 + y2), (x, y) ≠ (0, 0) 3x(log(x2 + y2) + 1) Find Əf ах af ду = for the following. 3y(log(x2 + y2) + 1) х

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