Find the unit tangent vector T and the principal unit normal vector N. r(t) = (7 + t)i + (4 + ln(sec t))j - 10k, -?/2 < t < ?/2
A. T = (cos t)i - (sin t)j; N = (-sin t)i - (cos t)j
B. T = (-cos t)i - (sin t)j; N = (-cos t)i + (sin t)j
C. T = (-cos t)i - (sin t)j; N = (sin t)i - (cos t)j
D. T = (cos t)i + (sin t)j; N = (- sin t)i + (cos t)j
Answer: D
Mathematics
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