Question: In Exercises find the principal unit normal vector to the curve at the specified value of the parameter. 2TT r(t) = 4 cos ti +

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

2TT r(t) = 4 cos ti + 4 sin tj + k,

2TT r(t) = 4 cos ti + 4 sin tj + k, t = 3

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