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OpenStax, Algebra and Trigonometry 2e §9.2 Sum and Difference Identities · Exercise 51 · Trigonometry · Compound & multiple angles

Sum and Difference Identities · Exercise 51

Prove the identities provided.

$\frac{cos ( x + h ) - cos x}{h} = cos x \frac{cos h - 1}{h} - s in x \frac{s inh}{h}$

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OpenStax, Algebra and Trigonometry 2e · §9.2 Sum and Difference Identities · Exercise 51

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