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Repère de Frenet
Animez le point M, observez les vecteurs[color=#c51414] [math]\vec N[/math][/color], [color=#1551b5][math]\vec T[/math][/color], le cercle osculateur et le rayon de courbure, [color=#0a971e][math]\rho= \Omega M[/math][/color]