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If the normal to the given hyperbola at the point `(c t , c/t)` meets the curve again at `(c t^(prime), c/t^(prime)),` then (A) `t^3t^(prime)=1` (B) `t^3t^(prime)=-1` (C) `t t^(prime)=1` (D) `t t^(prime)=-1`

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