Complex Numbers

$\left\{\frac{\pi}{4}, \frac{\pi}{2}, \frac{3 \pi}{4}, \pi, \frac{5 \pi}{4}, \frac{3 \pi}{2}, \frac{7 \pi}{4}, 2 \pi\right\}$

$\left\{\frac{\pi}{4}, \frac{3 \pi}{4}, \frac{5 \pi}{4}, \frac{7 \pi}{4}\right\}$

$\left\{\frac{\pi}{2}, \pi, \frac{3 \pi}{2}, 2 \pi\right\}$

$\phi$