nπ±π4n \pi \pm \frac{\pi}{4}nπ±4π
nπ±π3n \pi \pm \frac{\pi}{3}nπ±3π
nπ±π2n \pi \pm \frac{\pi}{2}nπ±2π
nπ+π2n \pi+\frac{\pi}{2}nπ+2π