2.5-i; -2+3.3*i; (2-i)^2
(-2-3i)^(1/5)
-sqrt(3)+sqrt(3)*i
(2-i)*(-4+3*i)
2*(cos(2*pi/3) + i*sin(2*pi/3))
e^(2*i)
e^(i*pi/3)