arcsin（根号2/2）+arctan(-1)+arccos(-根号3/2).A.-π/3 B.-π/6 C.2π/3 D.5π/6

arcsin（根号2/2）+arctan(-1)+arccos(-根号3/2).A.-π/3 B.-π/6 C.2π/3 D.5π/6

arcsin（根号2/2）+arctan(-1)+arccos(-根号3/2)
=π/4+(-π/4)+5π/6
=5π/6