θ=nπ+π4\theta=n \pi+\frac{\pi}{4}θ=nπ+4π
θ=nπ+π6\theta=\frac{n \pi+\pi}{6}θ=6nπ+π
2nπ2 n \pi2nπ
nπ±π4\mathrm{n} \pi \pm \frac{\pi}{4}nπ±4π