[IMG][/IMG]
( )partial derivative -...
(08-13-2013), (08-12-2013), (08-12-2013), (08-12-2013)
...(1- 4) (1-1) ( )
(08-13-2013), (08-12-2013), (08-12-2013), (08-12-2013), (08-12-2013), (08-12-2013)
: 1 (0 1 )
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