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