OpenStax, Algebra and Trigonometry 2e §9.3 Double-Angle, Half-Angle, and Reduction Formulas · Exercise 17 · Trigonometry · Compound & multiple angles
Double-Angle, Half-Angle, and Reduction Formulas · Exercise 17
Find the exact value using half-angle formulas.
OpenStax, Algebra and Trigonometry 2e · §9.3 Double-Angle, Half-Angle, and Reduction Formulas · Exercise 17
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Checked against the answer in OpenStax, Algebra and Trigonometry 2e.