Suppose θ is an angle such that cos(θ)= -7/9 If 0 < θ< π,

Last updated: 8/7/2022

Suppose θ is an angle such that cos(θ)= -7/9 If 0 < θ< π, then cos (θ/2) and sin (θ/2) If π<θ<2π then cos (θ/2) and sin(θ/2) If 2π < θ < 3π, then cos (θ/2) and sin (θ/2)