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 figure 2.png)
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Mathematics
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Find the unit tangent vector of the given curve.r(t) = (1 - 2t)i + (2t - 6)j + (9 + t)k
A. T = 
i - 
j - 
k
B. T = 
i - 
j - 
k
C. T = - 
i + 
j + 
k
D. T = - 
i + 
j + 
k
Mathematics
Evaluate the integral using the given substitution.
dx, u = 9x2
A. 
sin (9x2) + C
B. 
sin (9x2) + C
C. 
sin (u) + C
D. sin(9x2) + C
Mathematics
If 
and 
, find a formula for
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?
A. 
B. 
C. 
D. 
Mathematics
Use the rules for exponents to rewrite the expression and then evaluate the new expression. (72)-1
A. 
B. - 
C. -14
D. -49
Mathematics