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D( x )
(2*x-1)^2 = 0
(2*x-1)^2 = 0
(2*x-1)^2 = 0
2*x-1 = 0 // + 1
2*x = 1 // : 2
x = 1/2
x in (-oo:1/2) U (1/2:+oo)
1/((2*x-1)^2) = 4 // - 4
1/((2*x-1)^2)-4 = 0
1/((2*x-1)^2)+(-4*(2*x-1)^2)/((2*x-1)^2) = 0
1-4*(2*x-1)^2 = 0
16*x-16*x^2-3 = 0
16*x-16*x^2-3 = 0
16*x-16*x^2-3 = 0
DELTA = 16^2-(-16*(-3)*4)
DELTA = 64
DELTA > 0
x = (64^(1/2)-16)/(-16*2) or x = (-64^(1/2)-16)/(-16*2)
x = 1/4 or x = 3/4
(x-1/4)*(x-3/4) = 0
((x-1/4)*(x-3/4))/((2*x-1)^2) = 0
((x-1/4)*(x-3/4))/((2*x-1)^2) = 0 // * (2*x-1)^2
(x-1/4)*(x-3/4) = 0
( x-1/4 )
x-1/4 = 0 // + 1/4
x = 1/4
( x-3/4 )
x-3/4 = 0 // + 3/4
x = 3/4
x in { 1/4, 3/4 }
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