Question 1021334
 {{{Z[1]=8(cos 2pi/3 + i (sin 2pi/3)) = 8e^(i(2pi/3)) }}}

 {{{Z[2]= 0.5(cos pi/3 + i (sin pi/3)) = 0.5e^(i(pi/3))}}}

==> {{{Z[1]*Z[2] = 8e^(i(2pi/3))*0.5e^(i(pi/3)) = 4e^(i(2pi/3+pi/3))}}}

=  {{{4e^(i*pi) = 4(cos(pi)+isin(pi)) = highlight(-4)}}}