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D( m )
m^2 = 0
m^2 = 0
m^2 = 0
1*m^2 = 0 // : 1
m^2 = 0
m = 0
m in (-oo:0) U (0:+oo)
m+4*m+4/(m^2) = 0
5*m+4*m^-2 = 0
m*(4*m^-3+5) = 0
4*m^-3 = -5 // : 4
m^-3 = -5/4
-3 < 0
1/(m^3) = -5/4 // * m^3
1 = -5/4*m^3 // : -5/4
-4/5 = m^3
m^3 = -4/5 // ^ 1/3
m = -(4/5)^(1/3)
m = 0
m = 0
m in { 0}
m = -(4/5)^(1/3)
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