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Consider curve y=f(x), then if PT = Len...

Consider curve `y=f(x),` then if PT = Length of tangent PN= Length of normal TM=Length of subtangent MN=Length of sub normal, then `T MdotM N=f^(prime)(x)` (b) `(P T)/(P N)=1/(f^(prime)(x))` `C TdotP N=con s t a n t` (d) `P TdotT M=con s t a n t`

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