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[" 68.The equation of the directrix of t...

[" 68.The equation of the directrix of the parabola "],[" whose vertex and focus are "(1,4)" and "(2,6)],[" respectively is "],[[" (a) "x+2y=4," (b) "x-y=3],[" (c) "2x+y=5," (d) "x+3y=8]]

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