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• Unit Tangent and Normal: [; \underline{t}(t)= \frac{ \underline{v}(t) }{v(t)} \qquad \underline{n}(t)= \underline{ \widehat{t} }(t) ;]
• Frenet Coordinate System: [; F(t): \quad \left(\underline{r}(t),\underline{t}(t),\underline{n}(t) \right) ;]
  Generated: 31 Dec 1969, 21:00:00
  0 of 0 images
  Base Path: /usr/local/
  Glob Path: curves/Trochoid/1.0/0.25/0.0/400/*.svg
• Natural Angle: [; \underline{t}(t) = \left( \begin{array}{c} \cos{\theta(t) }\\ \sin{\theta(t) } \end{array} \right) ;]