[1-2a+a^2/a-1]-[√a^2-2a+1/a^2-a]-1/a
=[(a-1)^2/a-1]-[√(a-1)^2/a(a-1)]-1/a
=(a-1)-1/a-1/a
=a-1-2/a
=2-√3-1-4-2√3
=-3-3√3