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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)
(4*x^3-23-3+0)/(x^2-1) = 0
(4*x^3-23-3)/(x^2-1) = 0
(4*x^3-26)/(x^2-1) = 0
4*x^3 = 26 // : 4
x^3 = 13/2
x^3 = 13/2 // ^ 1/3
x = (13/2)^(1/3)
x = (13/2)^(1/3)
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