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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(((1/4)*x^-9)/25)*y^2 = 0
1/100*x^-9*y^2 = 0 // : 1/100*y^2
x^-9 = 0
x należy do O
x belongs to the empty set
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