(−π2,0)\left(-\frac{\pi}{2}, 0\right)(−2π,0)
(0,π)(0, \pi)(0,π)
(π2,2π)\left(\frac{\pi}{2}, 2 \pi\right)(2π,2π)
(−π2,π2)\left(-\frac{\pi}{2}, \frac{\pi}{2}\right)(−2π,2π)