Question: I need help on this question Express the product as a sum containing only sines or cosines. - 2sin (50) sin 0 O A. cos

I need help on this question

Express the product as a sum containing only sines or cosines. - 2sin (50) sin 0 O A. cos (60) + cos (40) O B. cos (60) - cos (40) O C. cos (70) + cos (30) O D. cos (70) - cos (30)
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