Величина \(arccos\left ( -\frac{1}{2} \right )-arctg\left ( -\sqrt{3} \right )\) равна

• \(\pi\)
• \(\frac{\pi }{6}\)
• \(\frac{\pi }{2}\)
• \(\frac{2\pi }{3}\)
• \(\frac{5\pi }{6}\)