http://im2.gulfup.com/2011-03-17/1300332689751.jpg (3) ...
( ) :
2 square root of pure imaginary number
:
2 x , y 2012 4 / 2
http://im2.gulfup.com/2011-03-17/1300332689751.jpg / ( ) / ( )
: 1 (0 1 )
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