2π3\frac{2 \pi}{3}32π
2nπ−2π32 \mathrm{n} \pi-\frac{2 \pi}{3}2nπ−32π
−2π3\frac{-2 \pi}{3}3−2π
2nπ+2π32 n \pi+\frac{2 \pi}{3}2nπ+32π