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D( X )
2.5*X^3 = 0
2.5*X^3 = 0
2.5*X^3 = 0
2.5*X^3 = 0 // : 2.5
X^3 = 0
X = 0
X in (-oo:0) U (0:+oo)
(4.32*X)/(2.5*X^3) = 0
1.728*X^-2 = 0 // : 1.728
X^-2 = 0
X należy do O
X belongs to the empty set
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