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[" Q.21The equation of directrix of a pa...

[" Q.21The equation of directrix of a parabola is "],[3x+4y+15=0" and equation of tangent at "],[" vertex is "3x+4y-5=0" .Then the length of "],[" latus rectum is equal to "],[[" (A) "15," (B) "14],[" (C) "13," (D) "16]]

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