Find the unit tangent vector T and the principal unit normal vector N. r(t) = (t2 - 5)i + (2t - 5)j + 8k
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: C
Mathematics
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B. 
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