1)arcsin√2/2 2)arcsin1/2 3)arcsin(-1) 4)arcsin(-√3/2) 5)arccos √3/2 6)arccos 0 7)arccos(-√2/2) 8)arccos(-1/2)

1) arcsin(√2/2) = π/4;

2)  arcsin(1/2) =  π/6;

3) arcsin(-1) = - arcsin(1) = -  π/2;

4) arcsin(-√3/2) = - arcsin(√3/2) = - π/6;

5) arccos(√3/2) = π/6; 

6) arccos(0) = π/2;

7) arccos(-√2/2) = -  arccos(√2/2) = -π/4;

8) arccos(-1/2) = -  arccos(1/2) = - π/3.