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D( x )
x^2-(2*x)+1 = 0
x^2-(2*x)+1 = 0
x^2-(2*x)+1 = 0
x^2-2*x+1 = 0
x^2-2*x+1 = 0
DELTA = (-2)^2-(1*1*4)
DELTA = 0
x = 2/(1*2)
x = 1 or x = 1
x in (-oo:1) U (1:+oo)
(0.7-0.4*x^2-(0.3*x))/(x^2-(2*x)+1) = 0
(0.7-0.4*x^2-0.3*x)/(x^2-2*x+1) = 0
0.7-0.4*x^2-0.3*x = 0
0.7-0.4*x^2-0.3*x = 0
DELTA = (-0.3)^2-(-0.4*0.7*4)
DELTA = 0.3^2+1.12
DELTA = 1.21
DELTA > 0
x = ((0.3^2+1.12)^(1/2)+0.3)/(-0.4*2) or x = (0.3-(0.3^2+1.12)^(1/2))/(-0.4*2)
x = -1.25*((0.3^2+1.12)^(1/2)+0.3) or x = -1.25*(0.3-(0.3^2+1.12)^(1/2))
(x+1.25*((0.3^2+1.12)^(1/2)+0.3))*(x+1.25*(0.3-(0.3^2+1.12)^(1/2))) = 0
x^2-2*x+1 = 0
x^2-2*x+1 = 0
DELTA = (-2)^2-(1*1*4)
DELTA = 0
x = 2/(1*2)
x = 1 or x = 1
(x-1)^2 = 0
((x+1.25*((0.3^2+1.12)^(1/2)+0.3))*(x+1.25*(0.3-(0.3^2+1.12)^(1/2))))/((x-1)^2) = 0
( x+1.25*((0.3^2+1.12)^(1/2)+0.3) )
x+1.25*((0.3^2+1.12)^(1/2)+0.3) = 0 // - 1.25*((0.3^2+1.12)^(1/2)+0.3)
x = -(1.25*((0.3^2+1.12)^(1/2)+0.3))
x = -1.25*((0.3^2+1.12)^(1/2)+0.3)
( x+1.25*(0.3-(0.3^2+1.12)^(1/2)) )
x+1.25*(0.3-(0.3^2+1.12)^(1/2)) = 0 // - 1.25*(0.3-(0.3^2+1.12)^(1/2))
x = -(1.25*(0.3-(0.3^2+1.12)^(1/2)))
x = -1.25*(0.3-(0.3^2+1.12)^(1/2))
x in { -1.25*(0.3-(0.3^2+1.12)^(1/2))}
x = -1.25*((0.3^2+1.12)^(1/2)+0.3)
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