Question: I need help on this question Express the sum or difference as a product of sines and/or cosines. cos (50) + cos (30) O A.
I need help on this question

Express the sum or difference as a product of sines and/or cosines. cos (50) + cos (30) O A. 2 cos (40) O B. 2 cos (40) cos 0 O C. 2 sin (40) sin 0 O D. 2 cos (40) sin 0
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