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Let two tangents be drawn to the ellipse...

Let two tangents be drawn to the ellipse `x^2/4+y^2/3 =1` from the point `P (4,sqrt3),` which touches the ellipse at `Q` and `R`. If equation of the radical axis of two cireles drawn `PQ` and `PR` as diameters is `ax-by= 2` then find the value of `(b^2-a^2)`

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