If on a given base and a triangle be described such that the sum of the tangents of the base angles is 4, then equation of locus of opposite vertex is parabola whose directrix is then the value of is |

If on a given base and a triangle be described such that the sum of the tangents of the base angles is 4, then equation of locus of opposite vertex is parabola whose directrix is then the value of is |

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