Let x=cosπ3+isinπ3 and Δ=1xx2x21x1x21 then numerical value of∆is
0
-1
8
-4
Use C3→C3−xC2 and C2→C2−xC1
Δ=100x21−x301x2−x1−x3
=1−x32=[1−cosπ−isinπ]2=8