a) Prove that if any two tangent lines to a parabola intersect at right angles, their
Chapter 10, Problem 85(choose chapter or problem)
a) Prove that if any two tangent lines to a parabola intersect at right angles, their point of intersection must lie on the directrix. (b) Demonstrate the result of part (a) by proving that the tangent lines to the parabola at the points and intersect at right angles, and that the point of intersection lies on the directrix.
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