If x+1x=2, then x3+1x3=
64
14
8
2
x+1x=2,Cubing, we getx3+1x3+3(x+1x)=(2)3⇒ x3+1x3+3(2)=8⇒x3+1x3=8−6=2
If x=2+√3, then x3+1x3 = __.