6.2 Trigonometric Functions: Unit Circle Approach/98

Failed to parse (MathML with SVG or PNG fallback (recommended for modern browsers and accessibility tools): Invalid response ("Math extension cannot connect to Restbase.") from server "https://en.wikipedia.org/api/rest_v1/":): {\displaystyle f(\theta)=\sin(\theta)}
Failed to parse (MathML with SVG or PNG fallback (recommended for modern browsers and accessibility tools): Invalid response ("Math extension cannot connect to Restbase.") from server "https://en.wikipedia.org/api/rest_v1/":): {\displaystyle g(\theta)=\cos{(\theta)}}
$\theta =60^{\circ }$

Failed to parse (MathML with SVG or PNG fallback (recommended for modern browsers and accessibility tools): Invalid response ("Math extension cannot connect to Restbase.") from server "https://en.wikipedia.org/api/rest_v1/":): {\displaystyle g\left(\frac{\theta}{2}\right)=g\left(\frac{60^{\circ}}{2}\right) = g(30^{\circ}) = \cos(60^{\circ}) = \frac{1}{2}}