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