√3 + 5cos⦸ = 3 cos⦸

Question

Can someone please explain for me how to express the answer in radian measure?

Thanks

Answer 1

√3 + 5cosθ = 3cosθ
2cosθ = -√3
cosθ = -√3/2

θ = 5π/6 or 7π/6

Answer 2

thank you steve!!