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D( X )
X = 0
X = 0
X = 0
X in (-oo:0) U (0:+oo)
1/X = (6/5)*X+1 // - (6/5)*X+1
1/X-((6/5)*X)-1 = 0
(-6/5)*X+1/X-1 = 0
1*X^-1-6/5*X^1-1*X^0 = 0
(1*X^0-6/5*X^2-1*X^1)/(X^1) = 0 // * X^2
X^1*(1*X^0-6/5*X^2-1*X^1) = 0
X^1
(-6/5)*X^2-X+1 = 0
(-6/5)*X^2-X+1 = 0
DELTA = (-1)^2-(1*4*(-6/5))
DELTA = 29/5
DELTA > 0
X = ((29/5)^(1/2)+1)/(2*(-6/5)) or X = (1-(29/5)^(1/2))/(2*(-6/5))
X = -5/12*((29/5)^(1/2)+1) or X = -5/12*(1-(29/5)^(1/2))
X in { -5/12*((29/5)^(1/2)+1), -5/12*(1-(29/5)^(1/2))}
X in { -5/12*((29/5)^(1/2)+1), -5/12*(1-(29/5)^(1/2)) }
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