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D( x )
3*x^2 = 0
3*x^2 = 0
3*x^2 = 0
3*x^2 = 0 // : 3
x^2 = 0
x = 0
x in (-oo:0) U (0:+oo)
9*x-(1/(3*x^2)) = 0
9*x+(-1/3)*x^-2 = 0
9*x^1-1/3*x^-2 = 0
(9*x^3-1/3*x^0)/(x^2) = 0 // * x^4
x^2*(9*x^3-1/3*x^0) = 0
x^2
9*x^3-1/3 = 0
9*x^3-1/3 = 0 // * 0
{ 1, -1 }
1
x = 1
27*x^3-1 = 26
1
-1
x = -1
27*x^3-1 = -28
-1
{ 1/3, -1/3, 1/9, -1/9, 1/27, -1/27, -1/3, 1/3, -1/9, 1/9, -1/27, 1/27 }
1/3
x
1/3
27*x^3-1 = 0
1/3
x-1/3
27*x^2+9*x+3
27*x^3-1
x-1/3
9*x^2-27*x^3
9*x^2-1
3*x-9*x^2
3*x-1
1-3*x
0
27*x^2+9*x+3 = 0
DELTA = 9^2-(3*4*27)
DELTA = -243
DELTA < 0
x in { 1/3}
x = 1/3
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