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D( m )
(8*m^2)^1 = 0
(8*m^2)^1 = 0
(8*m^2)^1 = 0
8*m^2 = 0
8*m^2 = 0 // : 8
m^2 = 0
m = 0
m in (-oo:0) U (0:+oo)
(((18*(5*m^4)^1)/4)/((8*m^2)^1))/4 = 0
(((5*18*m^4)/4)/(8*m^2))/4 = 0
45/64*m^2 = 0 // : 45/64
m^2 = 0
m = 0
m in { 0}
m belongs to the empty set
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