如图所示
x=t-sint
dx/dt =1 - cost
y=1-cost
dy/dt = sint
dy/dx = (dy/dt)/(dx/dt) = sint/(1-cost)
d/dt(dy/dx)
= [ cost. (1-cost) -sint.(sint) ]/(1-cost)^2
=(cost -1)/(1-cost)^2
=-1/(1-cost)
d^2y/dx^2
=d/dt(dy/dx) /(dx/dt)
=-1/(1-cost)^3
由y'求y'似乎不对，也看不出你怎么求出来的
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