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[" Lettwo tangents be dawn to the ellipse "(x^(2))/(4)+(y^(2))/(3)=1" firom the point "P(4,sqrt(3))" ,which touches the "],[" ellipseat "Q" and "R" If equation of the ndical axis of two circles drawn PQ and "PR" as diameters is "],[" ax-by "=2" then find the value of "(b^(2)-a^(2))]

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