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Un article trouvé pour ce sujet.
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Two tangent lines to a parabola |
2008-10-26 |
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Marcus pose la question :
Show that the tangent lines to the parabola y = ax^2 + bx + c at any two points with x-coordinates p and q must intersect at a point whose x-coordinate is halfway between p and q.
Penny Nom lui répond. |
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