Find the unit tangent vector T and the principal unit normal vector N. r(t) = 
(1 + t)3/2i + 
(1 - t)3/2j + 
tk
A. T = 
i + 
j + 
k; N = 
i + 
j
B. T = 
i - 
j + 
k; N = 
i + 
j
C. T = 
i - 
j + 
k; N = 2
i + 2
j
D. T = 
i - 
j + 
k; N = 
i + 
j
Answer: B
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