Complex Numbers

$\left\{n \pi+(-1)^n \frac{\pi}{4}, n \in z\right\}$

$\left\{\frac{n \pi}{2}+(-1)^n \frac{\pi}{4}, n \in z\right\}$

$\left\{n \pi+(-1)^n \frac{\pi}{2}, n \in z\right\}$

$\left\{2 n \pi \pm \frac{\pi}{4}, n \in z\right\}$