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What is the value of a for which f(x,y)=2x+3(x - y)+2i(3xy+ay) is an analytic function of complex variable z = x+iy (a) 1 (b)

What is the value of a for which f(x,y)=2x+3(x - y)+2i(3xy+ay) is an analytic function of complex variable z = x+iy (a) 1 (b) 0 (c) 3 (d) 2

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