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D( m )
m = 0
m = 0
m = 0
m in (-oo:0) U (0:+oo)
1/m-(1/9) = 4/9-((2/3)*m) // - 4/9-((2/3)*m)
(2/3)*m+1/m-(1/9)-(4/9) = 0
(2/3)*m+1/m-1/9-4/9 = 0
2/3*m^1+1*m^-1-5/9*m^0 = 0
(2/3*m^2-5/9*m^1+1*m^0)/(m^1) = 0 // * m^2
m^1*(2/3*m^2-5/9*m^1+1*m^0) = 0
m^1
(2/3)*m^2+(-5/9)*m+1 = 0
(2/3)*m^2+(-5/9)*m+1 = 0
DELTA = (-5/9)^2-(1*4*(2/3))
DELTA = -191/81
DELTA < 0
m in { }
m belongs to the empty set
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