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D( m )
(1/4)*m^3 = 0
(1/4)*m^3 = 0
(1/4)*m^3 = 0
1/4*m^3 = 0 // : 1/4
m^3 = 0
m = 0
m in (-oo:0) U (0:+oo)
((1/4)*m^3)^-2 = 0
16*m^-6 = 0 // : 16
m^-6 = 0
m należy do O
m belongs to the empty set
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