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[" If "b,k" are the intercepts of a foca...

[" If "b,k" are the intercepts of a focal chord of the parabola "y^(2)=4ax," then "k" is equal to "],[[" (1) "(ab)/(b-a)," (2) "(b)/(b-a)],[" (3) "(a)/(b-a)," (4) "(ab)/(a-b)]]

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