Find the unit tangent vector T and the principal unit normal vector N. r(t) = (t2 - 8)i   + (2t - 8)j  + 7k 

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: B

Mathematics

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