Express the product as a sum containing only sines or cosines.cos(3?) cos(6?)
A. 
[cos(9?) - sin(3?)]
B. 
[cos(3?) + cos(9?)]
C. 
[cos(9?) - cos(3?)]
D. cos2(12?2)
Answer: B
Mathematics
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A. ±2
B. -2i
C. -i
D. 2i
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Complete.46 ft = 
yd
A. 138
B. 3
C. 15
D. 552
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