10) sin Express the product as a sum containing only sines or cosines. 11) cos(40) cos(30) A) cos 0 9lam70) - sin 0] • cos(70)] B) lcos(70) - cos 0] D) cos2(1202) Express the sum or difference as a product of sines and/or cosines. 12) sin(20) - sin(40) A) -2 sin 0 cos(30) 9-2 sin 0 B) 2 cos(20) cos(30) D) 2 sin(30) cos 0

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A: Solution: The objective is to simplify the given expressions

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A:

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A:

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A: We can find the answer as below.

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A: The students Aviva and Chris got incorrect solutions.

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A:

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A: As per our guidelines we are supposed to answer only first three parts.kindly repost others part as…