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D( m )
m = 0
m = 0
m = 0
m in (-oo:0) U (0:+oo)
((3*m^-3)/(-2))*m^-2 = 0
-3/2*m^-5 = 0 // : -3/2
m^-5 = 0
m należy do O
m belongs to the empty set
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