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If V(x,y) = e^x(x cos y - y sin y), then prove that ∂^2V/∂x^2 + ∂^2V/∂y^2 = 0

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If V(x,y) = ex(x cos y - y sin y), then prove that ∂2V/∂x2 + ∂2V/∂y2 = 0

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V(x,y) = ex(x cos y - y sin y)

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