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lim x to inf of (1-2/(x-1)^2)/((x^2 + 2x - 1)/((x-1)x(x^2 + 1)ln^2((x^2 + 1)/((x-1)x)))
lim x to inf of (1-2/(x-1)^2)/((x^2 + 2x - 1)/((x-1)x(x^2 + 1)ln^2((x^2 + 1)/((x-1)x)))
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