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((w+1)/(w-1)-1)/(3((w-1)/(w+1))^3+2((w+1)/(w-1))^2-(w+1)/(w-1))
((w+1)/(w-1)-1)/(3((w-1)/(w+1))^3+2((w+1)/(w-1))^2-(w+1)/(w-1))
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