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D( m )
m = 0
m = 0
m = 0
m in (-oo:0) U (0:+oo)
m^-1*((90*m^4)/9) = 0
10*m^3 = 0 // : 10
m^3 = 0
m = 0
m in { 0}
m belongs to the empty set
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