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D( m )
m^2 = 0
m^2 = 0
m^2 = 0
1*m^2 = 0 // : 1
m^2 = 0
m = 0
m in (-oo:0) U (0:+oo)
((12/(m^2))*m)/4 = 0
3*m^-1 = 0 // : 3
m^-1 = 0
m należy do O
m belongs to the empty set
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