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TP and TQ are any two tangents to a pa...

`TP ` and `TQ ` are any two tangents to a parabola and the tangent at a third point `R` cuts them in `P'` and `Q'`. Prove that `(TP')/(TP)+(TQ')/(TQ)=1`

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The correct Answer is:
`therefore (TP')/(TP)+(TQ')/(TQ)=1`.
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