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If the normal to the rectangular hyperbola `x y=c^2` at the point `(c t ,c//t)` meets the curve again at `(c t^(prime),c//t '),t h e n` `t^3t^(prime)=1` (B) `t^3t^(prime)=-1` (C) `t.t^(prime)=1` (D) `t.t^(prime)=-1`

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