OpenStax, Algebra and Trigonometry 2e §9.4 Sum-to-Product and Product-to-Sum Formulas · Exercise 8 · Trigonometry · Compound & multiple angles
Sum-to-Product and Product-to-Sum Formulas · Exercise 8
Rewrite the product as a sum or difference.
Its source prints no answer for this problem, so there's nothing to check against.
OpenStax, Algebra and Trigonometry 2e · §9.4 Sum-to-Product and Product-to-Sum Formulas · Exercise 8
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