OpenStax, Precalculus 2e §7.3 Double-Angle, Half-Angle, and Reduction Formulas · Example 7 · Trigonometry · Compound & multiple angles
Using a Half-Angle Formula to Find the Exact Value of a Sine Function
Find using a half-angle formula.
OpenStax, Precalculus 2e · §7.3 Double-Angle, Half-Angle, and Reduction Formulas · Example 7
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