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D( m )
m^2+3 = 0
m^2+3 = 0
m^2+3 = 0
1*m^2 = -3 // : 1
m^2 = -3
m in (-oo:+oo)
(1-(2*m))/(m^2+3) = 0
(1-2*m)/(m^2+3) = 0
1-2*m = 0 // - 1
-2*m = -1 // : -2
m = -1/(-2)
m = 1/2
m = 1/2
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