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D( Y )
Y^2 = 0
Y^2 = 0
Y^2 = 0
1*Y^2 = 0 // : 1
Y^2 = 0
Y = 0
Y in (-oo:0) U (0:+oo)
256/(Y^2) = 0
256*Y^-2 = 0 // : 256
Y^-2 = 0
Y należy do O
Y belongs to the empty set
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