Question: In Exercises use the vector-valued function r(t) to find the principal unit normal vector N(t) using the alternative formula N = (vv)a (va)v ||(vv)a (va)v||*
In Exercises use the vector-valued function r(t) to find the principal unit normal vector N(t) using the alternative formula

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N = (vv)a (va)v ||(vv)a (va)v||*
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