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D( x )
x = 0
x^-10 = 0
x = 0
x = 0
x^-10 = 0
x^-10 = 0
1*x^-10 = 0 // : 1
x^-10 = 0
x należy do O
x in (-oo:0) U (0:+oo)
((X^-2*y^-10)/(x^-10))*y^-2 = 0
X^-2*x^10*y^-12 = 0 // : X^-2*y^-12
x^10 = 0
x = 0
x in { 0}
x belongs to the empty set
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