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Integrate (x^2 + y^2 + (1-x^2-y^2)/2) / ((x^2 + y^2 + ((1-x^2-y^2)/2)^2)^(3/2)
Integrate (x^2 + y^2 + (1-x^2-y^2)/2) / ((x^2 + y^2 + ((1-x^2-y^2)/2)^2)^(3/2)
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