f ( θ ) = sin ( θ ) {\displaystyle f(\theta )=\sin(\theta )} g ( θ ) = cos ( θ ) {\displaystyle g(\theta )=\cos {(\theta )}} θ = 60 ∘ {\displaystyle \theta =60^{\circ }} g ( θ 2 ) {\displaystyle g\left({\frac {\theta }{2}}\right)}
