OpenStax, Precalculus 2e §7.3 Double-Angle, Half-Angle, and Reduction Formulas · Exercise 54 · Trigonometry · Compound & multiple angles
Double-Angle, Half-Angle, and Reduction Formulas · Exercise 54
Algebraically find an equivalent function, only in terms of and/or and then check the answer by graphing both equations.
Its source prints no answer for this problem, so there's nothing to check against.
OpenStax, Precalculus 2e · §7.3 Double-Angle, Half-Angle, and Reduction Formulas · Exercise 54
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