The position vector of a particle is r(t). Find the requested vector.The velocity at t = 
for r(t) = 2sec2(t)i - 2tan(t)j + 9t2k
A. v
= 8i + 4j - 
?k
B. v
= 8i - 4j + 
?k
C. v
= -4j - 
?k
D. v
= -4j + 
?k
Answer: B
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