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z=+i
, i
i2 = -1
.
z=+i (,)=Re(z) z=Im(z) z
.
(x,y) , x y .
, .
, .
u , (x,y), (x,y) u=(x,y).
, .
.
, , , . z=+i , (z) (,) =(,) z.
(), .
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