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int from y=0 to y=sqrt(1-x^2) of (xy(2-x^2-y^2)^2/2-xy(x^2+y^2)^2/2) dy
int from y=0 to y=sqrt(1-x^2) of (xy(2-x^2-y^2)^2/2-xy(x^2+y^2)^2/2) dy
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