Evaluate the following expression. (x ? ?n, where n is a whole number)
?
?
A. 3 (csc x - sin x)
B. (csc x + sin x)
C. - 3 (csc x - sin x)
D. 3 (csc x + sin x)
E. (csc x - sin x)
Answer: A
Mathematics
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, 
A. 
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