[分析] 初微(21)

[PttFund (批踢踢基金只進不出)]

Assume that f is continuous on [2,+∞), and

        lim  x (log x)^2 f(x) = A≠0.
       x→∞

          ∞
Show that ∫ f(x) dx converges.
           2

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