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D( X )
X = 0
X = 0
X = 0
X in (-oo:0) U (0:+oo)
(9*X)/1-X+3/X-1 = 11 // - 11
(9*X)/1-X+3/X-11-1 = 0
9*X-X+3/X-11-1 = 0
8*X^1+3*X^-1-12*X^0 = 0
(8*X^2-12*X^1+3*X^0)/(X^1) = 0 // * X^2
X^1*(8*X^2-12*X^1+3*X^0) = 0
X^1
8*X^2-12*X+3 = 0
8*X^2-12*X+3 = 0
DELTA = (-12)^2-(3*4*8)
DELTA = 48
DELTA > 0
X = (48^(1/2)+12)/(2*8) or X = (12-48^(1/2))/(2*8)
X = (4*3^(1/2)+12)/16 or X = (12-4*3^(1/2))/16
X in { (12-4*3^(1/2))/16, (4*3^(1/2)+12)/16}
X in { (12-4*3^(1/2))/16, (4*3^(1/2)+12)/16 }
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