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D( m )
m^2 = 0
m^2 = 0
m^2 = 0
1*m^2 = 0 // : 1
m^2 = 0
m = 0
m in (-oo:0) U (0:+oo)
(m^9)/(m^2) = 0
1*m^7 = 0 // : 1
m^7 = 0
m = 0
m in { 0}
m belongs to the empty set
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