Question

6 arcsin (-√2/2) + 2 arccos (-√3/2) - 5 arcsin √3/2 + 3 arccos (-1/2)

Answer 1

6*(-π/4) + 2*(5π/6) - 5*(π/3) + 3*(2π/3) = 
-6π/4 + 5π/3 - 5π/3 + 2π = π/2