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Through a point `A` on the x-axis, a straight line is drawn parallel to the y-axis so as to meet the pair of straight lines `a x^2+2h x y+b y^2=0` at `B` and `Cdot` If `A B=B C ,` then (a) `h^2=4a b` (b) `8h^2=9a b` (c) `9h^2=8a b` (d) `4h^2=a b`

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CENGAGE PUBLICATION-STRAIGHT LINES-All Questions
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