{−π2}\left\{-\frac{\pi}{2}\right\}{−2π}
{π2}\left\{\frac{\pi}{2}\right\}{2π}
{−π2,π2}\left\{-\frac{\pi}{2}, \frac{\pi}{2}\right\}{−2π,2π}
{3π2}\left\{\frac{3 \pi}{2}\right\}{23π}
{−π2,3π2}\left\{-\frac{\pi}{2}, \frac{3 \pi}{2}\right\}{−2π,23π}