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D( x )
x^2-1 = 0
x^2-1 = 0
x^2-1 = 0
1*x^2 = 1 // : 1
x^2 = 1
x^2 = 1 // ^ 1/2
abs(x) = 1
x = 1 or x = -1
x in (-oo:-1) U (-1:1) U (1:+oo)
((3*x^2-(6*x)+3)/(x^2-1))*(x^2+3*x-4) = 0
((3*x^2-6*x+3)/(x^2-1))*(x^2+3*x-4) = 0
((3*x^2-6*x+3)*(x^2+3*x-4))/(x^2-1) = 0
3*x^2-6*x+3 = 0
3*(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
3*(x-1)^2 = 0
x^2+3*x-4 = 0
x^2+3*x-4 = 0
DELTA = 3^2-(-4*1*4)
DELTA = 25
DELTA > 0
x = (25^(1/2)-3)/(1*2) or x = (-25^(1/2)-3)/(1*2)
x = 1 or x = -4
(x+4)*(x-1) = 0
(3*(x-1)^3*(x+4))/(x^2-1) = 0
( x+4 )
x+4 = 0 // - 4
x = -4
( x-1 )
x-1 = 0 // + 1
x = 1
x in { 1}
x = -4
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