OpenStax, Algebra and Trigonometry 2e §9.3 Double-Angle, Half-Angle, and Reduction Formulas · Example 4 · Trigonometry · Compound & multiple angles

Verifying a Double-Angle Identity for Tangent

Verify the identity:

$t an (2 θ) = \frac{2}{co tθ - t an θ}$

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OpenStax, Algebra and Trigonometry 2e · §9.3 Double-Angle, Half-Angle, and Reduction Formulas · Example 4

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