Find the principal unit normal vector N for the curve r(t).r(t) = (3 sin t)i + (3 cos t)j + 4k
A. N(t) = (-sin t)i + (cos t)j
B. N(t) = (sin t)i + (cos t)j
C. N(t) = (-sin t)i - (cos t)j
D. N(t) = (-cos t)i - (sin t)j
Answer: C
Mathematics
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C. 
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