OpenStax, Algebra and Trigonometry 2e §9.4 Sum-to-Product and Product-to-Sum Formulas · Exercise 47 · Trigonometry · Compound & multiple angles

Sum-to-Product and Product-to-Sum Formulas · Exercise 47

Algebraically determine whether each of the given equation is an identity. If it is not an identity, replace the right-hand side with an expression equivalent to the left side. Verify the results by graphing both expressions on a calculator.

$2 cos (2 x) cos x + s in (2 x) s in x = 2 s in x$

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OpenStax, Algebra and Trigonometry 2e · §9.4 Sum-to-Product and Product-to-Sum Formulas · Exercise 47

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