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Please get correct answer Given r(t) = 9 cos (t) i - t j + 9 sin (t) k, find the unit normal vector N(t).

Please get correct answer

Given r(t) = 9 cos (t) i - t j + 9 sin (t) k, find the unit normal vector N(t). Provide your answer below: N(t ) = it + k

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