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### [¤j¾Ç] ¦³Ãö¦V¶q­È¨ç¼Æªº°ÝÃD

1. (The parametrization of a curve and its normal and curvature) Let C be a curve
parametrized by the vector-valued function

(a) Find the arc-length parametrization of the curve.
(b) Find the principal unit normal vector of C at
(c) Find the curvature of C at

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