OpenStax, Algebra and Trigonometry 2e §9.3 Double-Angle, Half-Angle, and Reduction Formulas · Exercise 3 · Trigonometry · Compound & multiple angles

Double-Angle, Half-Angle, and Reduction Formulas · Exercise 3

We can determine the half-angle formula for $t an (\frac{x}{2}) = \frac{1 - cos x}{1 + cos x}$ by dividing the formula for $s in (\frac{x}{2})$ by $cos (\frac{x}{2}) .$ Explain how to determine two formulas for $t an (\frac{x}{2})$ that do not involve any square roots.

~5 minWritten answer · compare with the solution

OpenStax, Algebra and Trigonometry 2e · §9.3 Double-Angle, Half-Angle, and Reduction Formulas · Exercise 3

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