Topic: normal line list of topics
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	Normal lines		2001-12-11
		From Kristie: Why are perpendicular lines called normal lines? Answered by Chris Fisher.
	Parametric Equations		1999-08-06
		From Nicholas Lawton: 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 Answered by Harley Weston.

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