Alexander6070 Alexander6070
  • 30-12-2022
  • Mathematics
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Use the vector-valued function r(t) to find the principal unit normal vector N(t) using the alternative formula N = (v · v)a − (v · a)v (v · v)a − (v · a)v . r(t) = 9 cos ti + 9 sin tj + 4tk

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