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D( a )
a^-3 = 0
a = 0
a^-3 = 0
a^-3 = 0
1*a^-3 = 0 // : 1
a^-3 = 0
a należy do O
a = 0
a = 0
a in (-oo:0) U (0:+oo)
(a^-5)/(a^-3) = 0
1*a^-2 = 0 // : 1
a^-2 = 0
a należy do O
a belongs to the empty set
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