Question: In Exercises find the principal unit normal vector to the curve at the specified value of the parameter. r(t) = 3 cos 2ti + 3

In Exercises find the principal unit normal vector to the curve at the specified value of the parameter.

r(t) = 3 cos 2ti + 3 sin 2tj + 3k, t

r(t) = 3 cos 2ti + 3 sin 2tj + 3k, t =

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