OpenStax, Algebra and Trigonometry 2e §9.3 Double-Angle, Half-Angle, and Reduction Formulas · Example 6 · Trigonometry · Compound & multiple angles

Using the Power-Reducing Formulas to Prove an Identity

Use the power-reducing formulas to prove

$s i n^{3} (2 x) = [\frac{1}{2} s in (2 x)] [1 - cos (4 x)]$

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OpenStax, Algebra and Trigonometry 2e · §9.3 Double-Angle, Half-Angle, and Reduction Formulas · Example 6

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