Find the unit tangent vector T and the principal unit normal vector N. r(t) = 
i + 
j + 4tk
A. T = 
(cos 0.375t)i - 
(sin 0.375t)j + 
k ; N = (-sin 0.375t)i - (cos 0.375t)j
B. T = 
(cos 0.375t)i - 
(sin 0.375t)j + 
k ; N = (-sin 0.375t)i - (cos 0.375t)j
C. T = 
(sin 0.375t)i - 
(cos 0.375t)j ; N = (-sin 0.375t)i - (cos 0.375t)j
D. T = 
(cos 0.375t)i - 
(sin 0.375t)j ; N = (-sin 0.375t)i - (cos 0.375t)j
Answer: A
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