solveSin(2theta)=1/2
2θ=sin^-1(0.5)Degrees:2θ=30,150,390,510...θ=15,75,195,255...Radians:2θ=π/6,5π/6,13π/6,17π/6...θ=π/12,5π/12,13π/12,17π/12...