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integrate 2/3 sqrt(-x^2-y^2+9) (2 x^2+2 y^2+9) dy from -sqrt(9-x^2) to sqrt(9-x^2)
integrate 2/3 sqrt(-x^2-y^2+9) (2 x^2+2 y^2+9) dy from -sqrt(9-x^2) to sqrt(9-x^2)
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