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((x+1)^(1/(3))-(x-1)^(1/(3)))[(x-1)^(2/3)+(x-1)^(1/(3))(x+1)^(1/(3))+(x+1)^(2/3)]
((x+1)^(1/(3))-(x-1)^(1/(3)))[(x-1)^(2/3)+(x-1)^(1/(3))(x+1)^(1/(3))+(x+1)^(2/3)]
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