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D( m )
m = 0
(2*m^-4)^3 = 0
m = 0
m = 0
(2*m^-4)^3 = 0
(2*m^-4)^3 = 0
8*m^-12 = 0 // : 8
m^-12 = 0
m należy do O
m in (-oo:0) U (0:+oo)
(2*m^-4)/((2*m^-4)^3) = 0
1/4*m^8 = 0 // : 1/4
m^8 = 0
m = 0
m in { 0}
m belongs to the empty set
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