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D( x )
1-(2*x^3) = 0
1-(2*x^3) = 0
1-(2*x^3) = 0
1-2*x^3 = 0
-2*x^3 = -1 // : -2
x^3 = 1/2
x^3 = 1/2 // ^ 1/3
x = (1/2)^(1/3)
x in (-oo:(1/2)^(1/3)) U ((1/2)^(1/3):+oo)
(8*x^3-1)/(1-(2*x^3)) = 0
(8*x^3-1)/(1-2*x^3) = 0
8*x^3 = 1 // : 8
x^3 = 1/8
x^3 = 1/8 // ^ 1/3
x = 1/2
x = 1/2
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