2) arcsin (-1/2) - arctg √3:

Математика. $$arcsin(-\frac{1}{2}) - arctg(\sqrt{3}) = -\frac{\pi}{6} - \frac{\pi}{3} = -\frac{\pi}{6} - \frac{2\pi}{6} = -\frac{3\pi}{6} = -\frac{\pi}{2}$$ Ответ: $$\frac{-\pi}{2}$$