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D( m )
m = 0
m = 0
m = 0
m in (-oo:0) U (0:+oo)
4*m^-2*((2*4*m^2*m^3)/2) = 0
16*m^3 = 0 // : 16
m^3 = 0
m = 0
m in { 0}
m belongs to the empty set
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