(( )) ( )2014(8) ( ) () 6
(04-28-2014), (04-29-2014), (04-28-2014), (04-29-2014)
(2) /... ( ) ......Find the rate of change of the area
(04-28-2014), (04-29-2014), (04-28-2014)
: 1 (0 1 )
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