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34. lim<x→0>e^(1/x^2)arctan[x^2/(x^2-x-2)]
= lim<x→0>[x^2/(x^2-x-2)]/e^(-1/x^2)
= lim<x→0>x^2/e^(-1/x^2) ( 令u = 1/x^2)
= lim<u→+∞>(1/u)/e^(-u) = lim<u→+∞>e^u/u (∞/∞)
= lim<u→+∞>e^u = +∞
= lim<x→0>[x^2/(x^2-x-2)]/e^(-1/x^2)
= lim<x→0>x^2/e^(-1/x^2) ( 令u = 1/x^2)
= lim<u→+∞>(1/u)/e^(-u) = lim<u→+∞>e^u/u (∞/∞)
= lim<u→+∞>e^u = +∞
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