f(z) = u(x, y) + iv(x, y) is an analytic function of complex variable z = x + iy. If v = xy then u(x, y) equals

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  1. x2 + y2
  2. x2 – y2

Answer (Detailed Solution Below)

Option 4 :

Detailed Solution

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Concept:

if f(z) = u(x, y) + iv(x, y) is an analytic function then Cauchy-Riemann condition will be satisfied.

i.e., 

Calculation:

Given:

v = xy​

If u = f(x, y)

du = xdx - ydy

Integrating both sides

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