Sujet: normal line liste de sujets
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	Normal lines		2001-12-11
		Kristie pose la question : Why are perpendicular lines called normal lines? Chris Fisher lui répond.
	Parametric Equations		1999-08-06
		Nicholas Lawton pose la question : Show that an equation of the normal to the curve with parametric equations x=ct y=c/t t not equal to 0, at the point (cp, c/p) is : y-c/p=xp^2-cp^3 Harley Weston lui répond.

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