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If f(x + iy) = x3 - 3xy2 + i$$\phi $$(x, y) where $${\text{i}} = \sqrt { - 1} $$   and f(x + iy) is an analytic function then $$\phi $$(x, y) is

If f(x + iy) = x3 - 3xy2 + i$$\phi $$(x, y) where $${\text{i}} = \sqrt { - 1} $$   and f(x + iy) is an analytic function then $$\phi $$(x, y) is Correct Answer 3x<sup>2</sup>y - y<sup>3</sup>

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