nπ2+(−1)nπ12\frac{\mathrm{n} \pi}{2}+(-1)^{n} \frac{\pi}{12}2nπ+(−1)n12π
nπ2+(−1)nπ6\frac{n \pi}{2}+(-1)^{n} \frac{\pi}{6}2nπ+(−1)n6π
nπ+(−1)nπ12\mathrm{n} \pi+(-1)^{n} \frac{\pi}{12}nπ+(−1)n12π
nπ+(−1)nπ6n \pi+(-1)^{n} \frac{\pi}{6}nπ+(−1)n6π