x=1+2I
y=3+4I
x+y => 4 + 6 I
x-y => -2 - 2 I
y x => -5 + 10 I
y/x => 11/5 - (2 I)/5
x^3 => -11 - 2 I
y^4 => -527 - 336 I
x^y => (1 + 2 I)^(3 + 4 I)
N[x^y] => 0.12901 + 0.0339241 I