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D( m )
m^-4 = 0
m = 0
(4*m^2)/(m^-4) = 0
m^-4 = 0
m^-4 = 0
1*m^-4 = 0 // : 1
m^-4 = 0
m należy do O
m = 0
m = 0
(4*m^2)/(m^-4) = 0
(4*m^2)/(m^-4) = 0
4*m^6 = 0 // : 4
m^6 = 0
m = 0
m in (-oo:0) U (0:+oo)
((4*m^2)/(m^-4))^-2 = 0
1/16*m^-12 = 0 // : 1/16
m^-12 = 0
m należy do O
m belongs to the empty set
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