(2,π4)\left(2, \frac{\pi}{4}\right)(2,4π)
(2,π6)\left(2, \frac{\pi}{6}\right)(2,6π)
(1,π3)\left(1, \frac{\pi}{3}\right)(1,3π)
(2,π3)\left(2, \frac{\pi}{3}\right)(2,3π)
