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D( x )
(x^5)/(X^2) = 0
X^2 = 0
(x^5)/(X^2) = 0
(x^5)/(X^2) = 0
X^-2*x^5 = 0 // : X^-2
x^5 = 0
x = 0
X^2 = 0
X^2 = 0
X^2 = 0
x należy do R
x belongs to the empty set
((x^5)/(X^2))^-4 = 0
x belongs to the empty set
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