If (x-a)^2+(y-b)^2=c^2, for some c >0, ...

If `(x-a)^2+(y-b)^2=c^2,` for some `c >0,` prove that`([1+((dy)/(dx))^2]^(3/2))/((d^2y)/(dx^2))` is a constant independent of` a and b.`

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