Evaluate the integral.
dx
A. 
sin-1 x - 
sin-1 x + 
x
+ C
B. 
sin-1 x - 
cos-1 x + 
+ C
C. 
sin-1 x - 
x sin-1 x - 
+ C
D. 
sin-1 x + 
sin-1 x - 
x
+ C
Answer: A
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A. - 
cos4 ? + C
B. - 
cos5 ? + C
C. 
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D. 
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