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D( a )
a^4 = 0
a^4 = 0
a^4 = 0
1*a^4 = 0 // : 1
a^4 = 0
a = 0
a in (-oo:0) U (0:+oo)
1/(a^4) = 0
1*a^-4 = 0 // : 1
a^-4 = 0
a należy do O
a belongs to the empty set
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