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[IMAGE] is a point on the ellipse
[IMAGE] If S and [IMAGE] are the focii
of the ellipse, then the equation of the external bisector of

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[IMAGE] Let [IMAGE] lies on [IMAGE] By property tangent at P externally bisects [IMAGE] Equation of the external bisector = Equation of
tangent at [IMAGE]

Source: Grass-G / M-14 Mathematics Paper 7 Nov.docx