5) \(\arccos\left(-\frac12\right)-\arcsin\left(-\frac{\sqrt3}{2}\right)\)

\(\arccos(-1/2)=2\pi/3\), \(\arcsin(-\sqrt3/2)=-\pi/3\).

\[\frac{2\pi}{3}-\left(-\frac{\pi}{3}\right)=\pi.\]

Ответ: \(\pi\).