Which complex number is a root of z2+z+1=0z^2 + z + 1 = 0z2+z+1=0?
eiπ/3e^{i\pi/3}eiπ/3
ei2π/3e^{i2\pi/3}ei2π/3
eiπ/2e^{i\pi/2}eiπ/2
eiπe^{i\pi}eiπ