OpenStax, Algebra and Trigonometry 2e §9.4 Sum-to-Product and Product-to-Sum Formulas · Exercise 23 · Trigonometry · Compound & multiple angles

Sum-to-Product and Product-to-Sum Formulas · Exercise 23

Evaluate the product using a sum or difference of two functions. Leave in terms of sine and cosine.

$2 s in (100°) s in (20°)$

~8 minWritten answer · check your work with Lemma

OpenStax, Algebra and Trigonometry 2e · §9.4 Sum-to-Product and Product-to-Sum Formulas · Exercise 23

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