Write the product as a sum or difference containing only sines or cosines.sin(8?) sin(4?)
A. 
[ cos(4?) - cos(12?)]
B. 
[cos(12?) - cos(4?)]
C. sin2(32?2)
D. 
[sin(12?) + cos(4?)]
Answer: A
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A. ?6 B. ?3 C. ?1 D. ?5
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