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D( m )
m = 0
m = 0
m = 0
m in (-oo:0) U (0:+oo)
m-(6/m)-8 = 0
m-6*m^-1-8 = 0
1*m^1-6*m^-1-8*m^0 = 0
(1*m^2-8*m^1-6*m^0)/(m^1) = 0 // * m^2
m^1*(1*m^2-8*m^1-6*m^0) = 0
m^1
m^2-8*m-6 = 0
m^2-8*m-6 = 0
DELTA = (-8)^2-(-6*1*4)
DELTA = 88
DELTA > 0
m = (88^(1/2)+8)/(1*2) or m = (8-88^(1/2))/(1*2)
m = (2*22^(1/2)+8)/2 or m = (8-2*22^(1/2))/2
m in { (8-2*22^(1/2))/2, (2*22^(1/2)+8)/2}
m in { (8-2*22^(1/2))/2, (2*22^(1/2)+8)/2 }
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