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D( x )
x = 0
x^-3 = 0
x = 0
x = 0
x^-3 = 0
x^-3 = 0
1*x^-3 = 0 // : 1
x^-3 = 0
x należy do O
x in (-oo:0) U (0:+oo)
((64*y^6)/(x^-3))^(1/3) = 0
4*x*y^2 = 0 // : 4*y^2
x = 0
x in { 0}
x belongs to the empty set
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