(x+i y, x, y in Rlongrightarrow (x, y))
(x=operatorname{Rez} quad y=operatorname{Imz})
(operatorname{Re} z=frac{1}{2}(z+ar{z}))
(ln z=frac{1}{2i}(z-ar{z}))
(operatorname{Re}left(z_{1}+z_{2}
ight)=operatorname{Re} z_{1}+operatorname{Re} z_{2})
(I_{m} left(z_{1}+z_{2}
ight)=I_{m} z_{1}+I_{m} z_{2})
(left.left(x_{1}, y_{2} ight) cdotleft(x_{2}, y_{2} ight)=(x_{1} x_{2}-y_{1} y_{2}, y_{1} x_{2}+x_{1} y_{2} ight))
Note:(leq) cannot be applied in (C)
Polan form
( heta= an ^{-1} frac{y}{x}):argument