2nπ+π22 \mathrm{n} \pi+\frac{\pi}{2}2nπ+2π
2nπ+7π122 \mathrm{n} \pi+\frac{7 \pi}{12}2nπ+127π
2nπ+π32 \mathrm{n} \pi+\frac{ \pi}{3}2nπ+3π
000