Find the unit tangent vector T and the principal unit normal vector N. r(t) = (t2 - 8)i + (2t - 2)j + 4k
A. T = i +
j; N =
i +
j
B. T = i +
j; N =
i -
j
C. T = i -
j; N = -
i -
j
D. T = i +
j; N =
i -
j
Answer: D
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