Find the unit tangent vector of the given curve.r(t) = 
i + 
j - 12tk
A. T(t) = 
i + 
j - 
k
B. T(t) = 
i + 
j - 
k
C. T(t) = 
i + 
j - 
k
D. T(t) = 
i + 
j - 
k
Answer: A
Mathematics
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