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D( m )
6*m^3 = 0
6*m^3 = 0
6*m^3 = 0
6*m^3 = 0 // : 6
m^3 = 0
m = 0
m in (-oo:0) U (0:+oo)
1/(6*m^3) = 0
1/6*m^-3 = 0 // : 1/6
m^-3 = 0
m należy do O
m belongs to the empty set
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