OpenStax, Algebra and Trigonometry 2e §9.2 Sum and Difference Identities · Exercise 3 · Trigonometry · Compound & multiple angles

Sum and Difference Identities · Exercise 3

Explain to someone who has forgotten the even-odd properties of sinusoidal functions how the addition and subtraction formulas can determine this characteristic for $f (x) = s in (x)$ and $g (x) = cos (x) .$ (Hint: $0 - x = - x$ )

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OpenStax, Algebra and Trigonometry 2e · §9.2 Sum and Difference Identities · Exercise 3

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