Determine the integral by making an appropriate substitution.
dx
A. - 
(x4 + 9)-1/2 + C
B. 
(x4 + 9)3/2 + C
C. 
(x4 + 9)3/2 + C
D. 
(x4 + 9)3/2 + C
Answer: B
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A. 
B. 
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D. 
?