Q.28 For an analytic function, f(x + iy)= u(i, y)+iVi, y), uis given by u = 3x2 -3y². The expression for v, considering K to be a constant is (a) 3y2-3r2 + K (c) 6y-6x + K k] ay (b) 6x - 6y + K (d) 6xy + K [CE, GATE-2011, 2 mark]

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