[考古] 請問幾題考古題

[flygey (努力達成目標)]

                               n        n        n
1. How to decide the order of x >n! or x <n! or x =n! for any x>0 and n->oo


    oo
   ---      n+1  2n-1
2. \    (-1)   pi
   /   ------------
   ---    (2n-1)!
   n=1



3.Find the length of arch of the cycloid having parametric equations
  x=t-sint, y=1-cost

請問這幾題如何解
感謝

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