sqrt(7) / 7 (t^2 + 1/7) / (t^2 - 1/7) where t = sqrt(7) / 21 + 2 / 3sqrt(7) / 7 (t^2 + 1/7) / (t^2 - 1/7) where t = sqrt(7) / 21 + 2 / 3

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