Use integration by parts to establish a reduction formula for the integral.
A. 
= 
cosn-1 x sin x + 
B. 
= cosn-1 x sin x - (n - 1) 
C. 
= - cosn-1 x sin x + (n - 1) 
D. 
= 
cosn-1 x sin x - 
Answer: A
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and 
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