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D( x )
x^3 = 0
x^3 = 0
x^3 = 0
1*x^3 = 0 // : 1
x^3 = 0
x = 0
x in (-oo:0) U (0:+oo)
2*x-(2/(x^3)) = 0
2*x-2*x^-3 = 0
2*x^1-2*x^-3 = 0
(2*x^4-2*x^0)/(x^3) = 0 // * x^6
x^3*(2*x^4-2*x^0) = 0
x^3
2*x^4-2 = 0
{ 1, -1, 2, -2 }
1
x = 1
2*x^4-2 = 0
1
x-1
2*x^3+2*x^2+2*x+2
2*x^4-2
x-1
2*x^3-2*x^4
2*x^3-2
2*x^2-2*x^3
2*x^2-2
2*x-2*x^2
2*x-2
2-2*x
0
2*x^3+2*x^2+2*x+2 = 0
{ 1, -1, 2, -2 }
1
x = 1
2*x^3+2*x^2+2*x+2 = 8
1
-1
x = -1
2*x^3+2*x^2+2*x+2 = 0
-1
x+1
2*x^2+2
2*x^3+2*x^2+2*x+2
x+1
-2*x^3-2*x^2
2*x+2
-2*x-2
0
2*x^2+2 = 0
DELTA = 0^2-(2*2*4)
DELTA = -16
DELTA < 0
x in { 1, -1}
x in { 1, -1 }
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