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