1. Для \(45^\circ\): \(\frac{45 \times \pi}{180} = \frac{\pi}{4}\) радиан.
2. Для \(160^\circ\): \(\frac{160 \times \pi}{180} = \frac{8\pi}{9}\) радиан.
3. Для \(-75^\circ\): \(\frac{-75 \times \pi}{180} = -\frac{5\pi}{12}\) радиан.
Ответ: \(\frac{\pi}{4}\), \(\frac{8\pi}{9}\), \(-\frac{5\pi}{12}\)