021.16. в) arccos(-\(\frac{\sqrt{3}}{2}\)) + arcsin(-\(\frac{\sqrt{3}}{2}\)); г) arccos \(\frac{\sqrt{2}}{2}\) - arcsin(-\(\frac{\sqrt{3}}{2}\));

в) arccos(-\(\frac{\sqrt{3}}{2}\)) + arcsin(-\(\frac{\sqrt{3}}{2}\)) = \(\frac{5\pi}{6} + (-\frac{\pi}{3}) = \frac{5\pi}{6} - \frac{2\pi}{6} = \frac{3\pi}{6} = \frac{\pi}{2}\) или 150° + (-60°) = 90°. г) arccos(\(\frac{\sqrt{2}}{2}\)) - arcsin(-\(\frac{\sqrt{3}}{2}\)) = \(\frac{\pi}{4} - (-\frac{\pi}{3}) = \frac{3\pi}{12} + \frac{4\pi}{12} = \frac{7\pi}{12}\) или 45° - (-60°) = 105°.