(Arccos(-1/2)-arcsin1/2)^2-1

Question

(Arccos(-1/2)-arcsin1/2)^2-1

Answer 1

1)arccos(-1/2)=π-arccos1/2=π-π/3=2π/3

2)arcsin1/2=π/6

3) 2π/3-π/6=π/2

4)(π/2)²-1=π²/4-1=(π²-4)/4