If we start at the point (1, 0) and travel once around the unit circle, we travel a distance of 2? units and arrive back where we started at the point (1, 0). If we continue around the unit circle a second time, we will repeat all the values of x and y that occurred during our first trip around. Use this discussion to evaluate the expression.
?
?
A. 
B. ?
C. ?
D. ?-1
E. ?1
Answer: D
Mathematics
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A. 
B. 
C. 
D. 
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A. 
B. 
C. 
D. 
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