Write the product as a sum or difference of trigonometric functions. sin 5x sin 13x O cos 8x - cos 18x (cos 18x + cos 8x) O sin 18x + sin 8x O cos 18x + cos 8x

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A: Given, cosθ=817 θ lies in IV quadrant so sine will be negative

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A:

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A:

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Q: sin cos

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A: Given information: The given expression is sin7xcos3x. Concept used: 2sinAsinB=sinA+B+sinA-B…

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A: Let's find.

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A: