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D( m )
3*m = 0
3*m = 0
3*m = 0
3*m = 0 // : 3
m = 0
m in (-oo:0) U (0:+oo)
(9*m^2)/(3*m)-(6/(3*m))-((4*m)/(3*m)) = 0
(9*m^2)/(3*m)-2*m^-1-4/3 = 0
3*m^1-2*m^-1-4/3*m^0 = 0
(3*m^2-4/3*m^1-2*m^0)/(m^1) = 0 // * m^2
m^1*(3*m^2-4/3*m^1-2*m^0) = 0
m^1
3*m^2+(-4/3)*m-2 = 0
3*m^2+(-4/3)*m-2 = 0
DELTA = (-4/3)^2-(-2*3*4)
DELTA = 232/9
DELTA > 0
m = ((232/9)^(1/2)-(-4/3))/(2*3) or m = (-(-4/3)-(232/9)^(1/2))/(2*3)
m = ((232/9)^(1/2)+4/3)/6 or m = (4/3-(232/9)^(1/2))/6
m in { (4/3-(232/9)^(1/2))/6, ((232/9)^(1/2)+4/3)/6}
m in { (4/3-(232/9)^(1/2))/6, ((232/9)^(1/2)+4/3)/6 }
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