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

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

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