Integrate[(4/Pi) (2 x^2 - y^2), {y, -3, 3}, {x, -Sqrt[9 - y^2], Sqrt[9 - y^2]}]Integrate[(4/Pi) (2 x^2 - y^2), {y, -3, 3}, {x, -Sqrt[9 - y^2], Sqrt[9 - y^2]}]

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