※ 引述《flygey (努力達成目標)》之銘言：
: 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
t: 0 -> 2π
dx/dt = 1-cost
dy/dt = sint
2π
L = ∫√((dx/dt)^2 + (dy/dt)^2) dt = ∫√(2) √(1-cost) dt
0
= (2)∫sin(t/2)dt = 8
: 請問這幾題如何解
: 感謝
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