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[" Let A and B be two distinct points on the parabola "y^(2)=4x" .If the axis of the parabola touches a "],[" circle of radius "r" having "AB" as its diameter,then the slope of the line joining "A" and "B" can be "],[[2010]],[[" (A) "-(1)/(r)," (B) "(1)/(r)," (C) "(2)/(r)," (D) "-(2)/(r)]]

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