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D( m )
2*m^2 = 0
2*m = 0
2*m^2 = 0
2*m^2 = 0
2*m^2 = 0 // : 2
m^2 = 0
m = 0
2*m = 0
2*m = 0
2*m = 0 // : 2
m = 0
m in (-oo:0) U (0:+oo)
1/(2*m^2) = 1/(2*m)-(1/2) // - 1/(2*m)-(1/2)
1/(2*m^2)-(1/(2*m))+1/2 = 0
(-1/2)*m^-1+1/(2*m^2)+1/2 = 0
1/2*m^-2-1/2*m^-1+1/2 = 0
t_1 = m^-1
1/2*t_1^2-1/2*t_1^1+1/2 = 0
1/2*t_1^2-1/2*t_1+1/2 = 0
DELTA = (-1/2)^2-(1/2*1/2*4)
DELTA = -3/4
DELTA < 0
m belongs to the empty set
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