OpenStax, Algebra and Trigonometry 2e §9.3 Double-Angle, Half-Angle, and Reduction Formulas · Exercise 20 · Trigonometry · Compound & multiple angles

Double-Angle, Half-Angle, and Reduction Formulas · Exercise 20

Find the exact values of a) $s in (\frac{x}{2}),$ b) $cos (\frac{x}{2}),$ and c) $t an (\frac{x}{2})$ without solving for $x,$ when $0 \leq x < 2 π$

If $t an x = - \frac{4}{3},$ and $x$ is in quadrant IV.

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OpenStax, Algebra and Trigonometry 2e · §9.3 Double-Angle, Half-Angle, and Reduction Formulas · Exercise 20

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