Answer: (a) Show that is perpendicular to . (b) Show that is perpendicular to . (c)
Chapter 13, Problem 59(choose chapter or problem)
(a) Show that is perpendicular to . (b) Show that is perpendicular to . (c) Deduce from parts (a) and (b) that for some number called the torsion of the curve. (The torsion measures the degree of twisting of a curve.) (d) Show that for a plane curve the torsion is .
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