Verify the identity. (Simplify 3 cos x 3 cos y sin x + sin y 3 cos x at each step.) sin x + sin y + 3 sin x-3 sin y = 0 cos x+cos y 3 cos y 3 sin x - 3 sin y = cos x+cos y = 3 cos x- 3 cos²x - 3(cos? x = 0 X[ (sin x + sin y) (cos x + cos y) + 3 sin² x 3 sin² y (sin x + sin y) (cos x + cos y) x + ) -3 (cos² y + (sin x + sin y) (cos x + cos y) + cos y) + 3 (sin x - sin y) (sin x + sin y)

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A: We use substitution method

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Q: True or false: If cos A is negative, then cos (A/2) is negative as well.

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Q: 1 1. Use basic identities to simplify the expression secx cos x + cos x secx

A: Since the student has posted multiple questions and does not mention any specific question, so we…

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Q: 6. Rewrite over a common denominator: 1 /1 - cos v + 1/ 1 + cos v

A: We have given 11-cosv+11+cosv Then, 11-cosv+11+cosv=1+cosv+1-cosv1-cosv1+cosv=21-cos2v=2sin2v

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