A variable chord PQ of the parabola subtends a right angle at the vertex. Equation of the locus of the points of intersection of the normals at P and Q is represented by
, then p is
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If A is vertex of the parabola then
Equations of normals P and Q respectively, are
...[1]
...[2]
Let the normals (1) and (2) intersect at (h, k) then solving (1) and (2), we get
....[4]
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