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lim x->0 ((1 + arctan(x^2 + x))^(1/3) - 1)/((x^2 + 1)^(1/x^2) sin(x^2 + x))
lim x->0 ((1 + arctan(x^2 + x))^(1/3) - 1)/((x^2 + 1)^(1/x^2) sin(x^2 + x))
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