Evaluate the integral using the given substitution.
dx , u = - 
A. - 
+ 
sin 
+ C
B. - 
+ sin3 
+ C
C. 
+ 
sin 
+ C
D. - 
+ 
sin 
+ C
Answer: A
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A. 8?
B. 2?
C. 
?
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or 
count the different ways of choosing the following officers or representatives for student congress. Assume that no one can hold more than one office.Four representatives
A. 1 B. 4 C. 120 D. 10
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