aresin(-1) + arctg(- V3) + arccos-1/2

Assuming standard principal values:

• arcsin(-1) = -π/2
• arctan(-√3) = -π/3
• arccos(-1/2) = 2π/3

Sum: (-π/2) + (-π/3) + (2π/3) = -π/2 + π/3 = -π/6

So the value is -π/6 (which is -30 degrees).