# A calculus problem by Jose Sacramento

Calculus Level pending

Evaluate $$\iint_S (\nabla \times A)n \, dS$$ where $$A = (x-z, x^3 + yz, -3xy^2)$$ and $$S$$ is the surface of the cone $$z = 2-\sqrt{x^2+y^2}$$ above the $$xy$$ plane.

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