Question: Please help answer my question 15. Thank you. Express the product as a sum containing only sines or cosines. cos (60) cos (50) O A.
Please help answer my question 15. Thank you.

Express the product as a sum containing only sines or cosines. cos (60) cos (50) O A. cos 2 (3002) 1 O B. [cos 0 + cos (110)] O C. [ cos (110) - cos 0] 1 O D. [cos (110) - sin 0]
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