(∂u/∂x)=(∂v/∂y) and (∂u/∂y)=(-∂v/∂x)
∂u/∂x = 2x/(x^2+y^2) ∂u/∂y = 2y/(x^2+y^2 ∂v/∂x = -2y/(x^2+y^2) ∂v/∂y = 2x/(x^2+y^2
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