Find the principal unit normal vector N for the curve r(t).r(t) = (1 + t)i + (3 + ln(cos t))k, -?/2 < t < ?/2
A. N(t) = (-cos t)i - (ln(cos t))k
B. N(t) = (-sin t)i - (cos t)k
C. N(t) = (-cos t)i - (tan t)k
D. N(t) = (cos t)i + (sin t)k
Answer: B
Mathematics
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