Express the product as a sum containing Sines or Cosines; Cos (3a) Cos (2a) Cos 3a O (Cos a + Cos 5a) 5a O Cos 응 + Cos 뜨 2 (Cos a - Cos 5a)

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A:

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A: l have given the answer in the next step. Hope you understand that

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A: sin2A