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D( m )
2*m^2 = 0
2*m^2 = 0
2*m^2 = 0
2*m^2 = 0 // : 2
m^2 = 0
m = 0
m in (-oo:0) U (0:+oo)
8/(2*m^2) = 0
4*m^-2 = 0 // : 4
m^-2 = 0
m należy do O
m belongs to the empty set
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