θ=2nπ−π3\theta=2 n \pi-\frac{\pi}{3}θ=2nπ−3π
θ=2nπ+π3\theta=2 n \pi+\frac{\pi}{3}θ=2nπ+3π
θ=2nπ+π6\theta=2 n \pi+\frac{\pi}{6}θ=2nπ+6π
θ=2nπ−π6\theta=2 n \pi-\frac{\pi}{6}θ=2nπ−6π