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

Writing the Product as a Sum Containing only Sine or Cosine

Express the following product as a sum containing only sine or cosine and no products: $s in (4 θ) cos (2 θ) .$

~5 minWritten answer · check your work with Lemma

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

Stuck? A gentle nudge

No hints for this one.

Something off?

Workspace

Your working

Check your full solution

Attach photos of your pages (up to 3) or one PDF — or check what you typed above. Lemma reads the work and verifies the reasoning, not just the answer.

Your first check today doesn't need an account.

Your photos and PDFs are read once and not stored — only the transcription is kept.