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expand (x-(-y^2-1)^(1/3)) * (x^2 + (-y^2-1)^(1/3) * x + (-y^2-1)^(1/3))
expand (x-(-y^2-1)^(1/3)) * (x^2 + (-y^2-1)^(1/3) * x + (-y^2-1)^(1/3))
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