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I need help on this question Express the product as a sum containing only sines or cosines. 110 COS COS N D 2 O A.

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Express the product as a sum containing only sines or cosines. 110 COS COS N D 2 O A. - cos 2(110) O B. [cos (120) - sin (100)] O C. 7[ cos (60) - sin (50)] 1 [(09) soo + (09) soo ] .a O

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