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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
X^3-(1/x)-1 = 0
X^3-x^-1-1 = 0
-1*x^-1 = -(X^3-1) // : -1
x^-1 = X^3-1
-1 < 0
1/(x^1) = X^3-1 // * x^1
1 = x^1*(X^3-1) // : X^3-1
1/(X^3-1) = x^1
x = 1/(X^3-1)
x = 1/(X^3-1)
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