4arccos(√3/2)-1/2 arcsin(-√2/2)

[tex]4arccos\frac{\sqrt3}{2}-\frac{1}{2}arcsin(-\frac{\sqrt2}{2})=4\cdot \frac{\pi}{6}-\frac{1}{2}\cdot (-\frac{\pi}{4})=\frac{2\pi}{3}+\frac{\pi}{8}=\frac{19\pi}{24}[/tex]