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Express the product as a sum containing only sines or cosines. sin (20) sin (50) O A. ~[cos (30) - cos (70)] 1 O B.

Express the product as a sum containing only sines or cosines. sin (20) sin (50) O A. ~[cos (30) - cos (70)] 1 O B. [- cos (30) - cos (70)] O C. sin 2 (1002 ) O D. ~[cos (70) - sin (30)]

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