Question: Question 7 Express the product as a sum containing only sines or cosines. cos (50) cos (80) . . . 1 O A. 7[cos (130)

Question 7

Express the product as a sum containing only sines or cosines. cos (50) cos (80) . . . 1 O A. 7[cos (130) - cos (30)] O B. 7[cos (130) - sin (30)] O C. cos 2 (2802) 1 O D. 7[cos (30) + cos (130)]
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