x=nπ±π2x=n \pi \pm \frac{\pi}{2}x=nπ±2π
x=nπ+π2x=n \pi+\frac{\pi}{2}x=nπ+2π
x=nπ±π4x=n \pi \pm \frac{\pi}{4}x=nπ±4π
x=nπ+π4x=n \pi+\frac{\pi}{4}x=nπ+4π