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D( x )
(4-x)*(1-x) = 0
(4-x)*(1-x) = 0
(4-x)*(1-x) = 0
( 1-x )
1-x = 0 // - 1
-x = -1 // * -1
x = 1
( 4-x )
4-x = 0 // - 4
-x = -4 // * -1
x = 4
x in (-oo:1) U (1:4) U (4:+oo)
(x^2)/((4-x)*(1-x)) = 0.0079 // - 0.0079
(x^2)/((4-x)*(1-x))-0.0079 = 0
(x^2)/((4-x)*(1-x))+(-0.0079*(4-x)*(1-x))/((4-x)*(1-x)) = 0
x^2-0.0079*(4-x)*(1-x) = 0
0.9921*x^2+0.0395*x-0.0316 = 0
0.9921*x^2+0.0395*x-0.0316 = 0
0.9921*x^2+0.0395*x-0.0316 = 0
DELTA = 0.0395^2-(-0.0316*0.9921*4)
DELTA = 0.0395^2+0.12540144
DELTA = 0.12696169
DELTA > 0
x = ((0.0395^2+0.12540144)^(1/2)-0.0395)/(0.9921*2) or x = (-(0.0395^2+0.12540144)^(1/2)-0.0395)/(0.9921*2)
x = 0.50398145*((0.0395^2+0.12540144)^(1/2)-0.0395) or x = -0.50398145*((0.0395^2+0.12540144)^(1/2)+0.0395)
(x+0.50398145*((0.0395^2+0.12540144)^(1/2)+0.0395))*(x-0.50398145*((0.0395^2+0.12540144)^(1/2)-0.0395)) = 0
((x+0.50398145*((0.0395^2+0.12540144)^(1/2)+0.0395))*(x-0.50398145*((0.0395^2+0.12540144)^(1/2)-0.0395)))/((4-x)*(1-x)) = 0
((x+0.50398145*((0.0395^2+0.12540144)^(1/2)+0.0395))*(x-0.50398145*((0.0395^2+0.12540144)^(1/2)-0.0395)))/((4-x)*(1-x)) = 0 // * (4-x)*(1-x)
(x+0.50398145*((0.0395^2+0.12540144)^(1/2)+0.0395))*(x-0.50398145*((0.0395^2+0.12540144)^(1/2)-0.0395)) = 0
( x+0.50398145*((0.0395^2+0.12540144)^(1/2)+0.0395) )
x+0.50398145*((0.0395^2+0.12540144)^(1/2)+0.0395) = 0 // - 0.50398145*((0.0395^2+0.12540144)^(1/2)+0.0395)
x = -(0.50398145*((0.0395^2+0.12540144)^(1/2)+0.0395))
x = -0.50398145*((0.0395^2+0.12540144)^(1/2)+0.0395)
( x-0.50398145*((0.0395^2+0.12540144)^(1/2)-0.0395) )
x-0.50398145*((0.0395^2+0.12540144)^(1/2)-0.0395) = 0 // + -0.50398145*((0.0395^2+0.12540144)^(1/2)-0.0395)
x = -(-0.50398145*((0.0395^2+0.12540144)^(1/2)-0.0395))
x = 0.50398145*((0.0395^2+0.12540144)^(1/2)-0.0395)
x in { -0.50398145*((0.0395^2+0.12540144)^(1/2)+0.0395), 0.50398145*((0.0395^2+0.12540144)^(1/2)-0.0395) }
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