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D( Y )
Y^4 = 0
Y^4 = 0
Y^4 = 0
1*Y^4 = 0 // : 1
Y^4 = 0
Y = 0
Y in (-oo:0) U (0:+oo)
Y/(Y^4) = 0
1*Y^-3 = 0 // : 1
Y^-3 = 0
Y należy do O
Y belongs to the empty set
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