Вычислить \(arccos(-\frac{\sqrt2}{2})-arctg\frac{1}{\sqrt3}\)

• \(-\frac{5\pi }{12}\)
• \(\frac{5\pi }{12}\)
• \(-\frac{7\pi }{12}\)
• \(\frac{11\pi }{12}\)
• \(\frac{7\pi }{12}\)