1. Для \(108^\circ\): \(\frac{108 \times \pi}{180} = \frac{3\pi}{5}\) радиан.
2. Для \(135^\circ\): \(\frac{135 \times \pi}{180} = \frac{3\pi}{4}\) радиан.
3. Для \(-300^\circ\): \(\frac{-300 \times \pi}{180} = -\frac{5\pi}{3}\) радиан.
Ответ: \(\frac{3\pi}{5}\), \(\frac{3\pi}{4}\), \(-\frac{5\pi}{3}\)