If f(x)=a+bx+cx2 and α,β,γ are the roots of the equation x3=1, then ∣∣ ∣∣abcbcacab∣∣ ∣∣ is equal to
If α,β,γ are roots equation x3+ax2+bx+c=0, then α−1+β−1+γ−1=