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D( m )
m^2 = 0
m = 0
4/(m^2)+1/3 = 0
m^2 = 0
m^2 = 0
1*m^2 = 0 // : 1
m^2 = 0
m = 0
m = 0
m = 0
4/(m^2)+1/3 = 0
4/(m^2)+1/3 = 0
4*m^-2 = -1/3 // : 4
m^-2 = -1/12
-2 < 0
1/(m^2) = -1/12 // * m^2
1 = -1/12*m^2 // : -1/12
-12 = m^2
m in (-oo:0) U (0:+oo)
(3/m-(2/9))/(4/(m^2)+1/3) = 0
(3/m-2/9)/(4/(m^2)+1/3) = 0
(3*m^-1-2/9)/(4*m^-2+1/3) = 0
3*m^-1 = 2/9 // : 3
m^-1 = 2/27
-1 < 0
1/(m^1) = 2/27 // * m^1
1 = 2/27*m^1 // : 2/27
27/2 = m^1
m = 27/2
m = 27/2
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