Find the principal unit normal vector N for the curve r(t).r(t) = (4 sin t)i  + (4 cos t)j + 8k

A. N = (-cos t)i - (sin t)j
B. N = (sin t)i + (cos t)j
C. N = (-sin t)i - (cos t)j
D. N = (-sin t)i + (cos t)j

Answer: C

Mathematics

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