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