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Two Tangent Lines to a Parabola
Two tangent lines to the graph of intersect in a point that is horizontally equidistant from the points of tangency.



Reference: M. Stenlund, "On the Tangent Lines of a Parabola," The College Mathematics Journal, 32(3), 2001 pp. 194–196.


"Two Tangent Lines to a Parabola" from The Wolfram Demonstrations Project
 http://demonstrations.wolfram.com/TwoTangentLinesToAParabola/
Contributed by: Soledad Mª Sáez Martínez and Félix Martínez de la Rosa
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