Find the unit tangent vector T and the principal unit normal vector N. r(t) = 
i + 
j + 4tk
A. T = 
(cos 0.75t)i - 
(sin 0.75t)j ; N = (-sin 0.75t)i - (cos 0.75t)j
B. T = 
(sin 0.75t)i - 
(cos 0.75t)j ; N = (-sin 0.75t)i - (cos 0.75t)j
C. T = 
(cos 0.75t)i - 
(sin 0.75t)j + 
k ; N = (-sin 0.75t)i - (cos 0.75t)j
D. T = 
(cos 0.75t)i - 
(sin 0.75t)j + 
k ; N = (-sin 0.75t)i - (cos 0.75t)j
Answer: D
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A. Q(x) = 1 + 
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B. Q(x) = 
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C. Q(x) = - 
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?3.8 cm
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