lim(n→∞)(sin(n+√(n^2+n)))^2lim(n→∞)(1/n!(1!+2!+…+n!))

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lim(n→∞)(sin(n+√(n^2+n)))^2lim(n→∞)(1/n!(1!+2!+…+n!))

lim(n→∞)(sin(n+√(n^2+n)))^2lim(n→∞)(1/n!(1!+2!+…+n!))
lim(n→∞)(sin(n+√(n^2+n)))^2
lim(n→∞)(1/n!(1!+2!+…+n!))

lim(n→∞)(sin(n+√(n^2+n)))^2lim(n→∞)(1/n!(1!+2!+…+n!))
1) 做过一道和你的第一题类似的题,写起来太多,不想再写一遍,提供给你,
首先,
    {sin[π√n(n+1)]}^2 = {sin[π√n(n+1)]}^2 - [sin(πn+π/2)]^2 + [sin(πn+π/2)]^2,

   |{sin[π√n(n+1)]}^2 - [sin(πn+π/2)]^2|
  = |sin[π√n(n+1)] - sin(πn+π/2)|*|sin[π√n(n+1)] + sin(πn+π/2)|

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