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evaluate (1/2 (sqrt(93) - 9))^(1/3)/3^(2/3) - (2/(3 (sqrt(93) - 9)))^(1/3)
evaluate (1/2 (sqrt(93) - 9))^(1/3)/3^(2/3) - (2/(3 (sqrt(93) - 9)))^(1/3)
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