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lim x->1 (v(1 - x) - (1 - x^v) + (x(1 - x^v) - v(1 - x)) / s) / (4pi(1 - x)^2 x^v)
lim x->1 (v(1 - x) - (1 - x^v) + (x(1 - x^v) - v(1 - x)) / s) / (4pi(1 - x)^2 x^v)
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