Double-Angle, Half-Angle, and Reduction Formulas · Exercise 26

Use the figure to find the requested half and double angles.

Find $sin\left(\frac{\theta }{2}\right),cos\left(\frac{\theta }{2}\right),$ and $tan\left(\frac{\theta }{2}\right).$

Its source prints no answer for this problem, so there's nothing to check against.

OpenStax, Algebra and Trigonometry 2e · §9.3 Double-Angle, Half-Angle, and Reduction Formulas · Exercise 26