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[" The length of a focal chord of the parabola "y^(2)=4ax" at a distance b from the vertex is "c" ,then "],[[" (A) "2a^(2)=bc," (B) "a^(3)=b^(2)c],[[" (C) "ac=b^(2)," (D) "b^(2)c=4a^(3)]]]

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