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D( x )
x-2 = 0
x-2 = 0
x-2 = 0
x-2 = 0 // + 2
x = 2
x in (-oo:2) U (2:+oo)
(x-3)/(x-2) < 0
( x-2 )
x-2 < 0 // + 2
x < 2
( x-3 )
x-3 < 0 // + 3
x < 3
(-oo:2) (2:3) (3:+oo) x-2 - + + x-3 - - +
x in (2:3)
(2:3)
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