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