Find the principal unit normal vector N for the curve r(t).r(t) = (7t sin t + 7 cos t)i + (7t cos t - 7 sin t))k
A. N(t) = (-sin t)i - (cos t)k
B. N(t) = - 
(cos t)i - 
(sin t)k
C. N(t) = (sin t)i + (cos t)k
D. N(t) = (cos t)i - (sin t)k
Answer: A
Mathematics
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, 
, . . .
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B. r = - 
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D. r = 
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B. - 
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D. - 
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