OpenStax, Algebra and Trigonometry 2e §9.2 Sum and Difference Identities · Example 9 · Trigonometry · Compound & multiple angles

Verifying an Identity Involving Tangent

Verify the following identity.

$\frac{s in ( α - β )}{cos α cos β} = t an α - t an β$

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OpenStax, Algebra and Trigonometry 2e · §9.2 Sum and Difference Identities · Example 9

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