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 ) = g ( 60 2 ) = g ( 30 ) {\displaystyle g\left({\frac {\theta }{2}}\right)=g\left({\frac {60}{2}}\right)=g(30)}
