http://www.alnasiry.com/mydoc/Eccentricity.swf
Trieng 34 - - ...
... 4 5 9 3
( 4) \ 24 03 ( ) ...Hyperbola conic \ 5
http://im2.gulfup.com/2011-03-17/1300332689751.jpg ... / ( ) prove that
..
2011 square root of pure imaginary number
: 1 (0 1 )
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