Express the product as a sum containing only sines or cosines.sin(7?) cos(3?)
A. 
[cos(10?) - cos(4?)]
B. sin cos(21?2)
C. 
[sin(10?) + cos(4?)]
D. 
[sin(10?) + sin(4?)]
Answer: D
Mathematics
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A. 
B. 
C. 
D. 
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