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D( x )
x^2 = 0
x^2 = 0
x^2 = 0
1*x^2 = 0 // : 1
x^2 = 0
x = 0
x in (-oo:0) U (0:+oo)
6*x+6/(x^2) = 0
6*x^1+6*x^-2 = 0
(6*x^3+6*x^0)/(x^2) = 0 // * x^4
x^2*(6*x^3+6*x^0) = 0
x^2
6*x^3+6 = 0
{ 1, -1, 2, -2, 3, -3, 6, -6 }
1
x = 1
6*x^3+6 = 12
1
-1
x = -1
6*x^3+6 = 0
-1
x+1
6*x^2-6*x+6
6*x^3+6
x+1
-6*x^3-6*x^2
6-6*x^2
6*x^2+6*x
6*x+6
-6*x-6
0
6*x^2-6*x+6 = 0
DELTA = (-6)^2-(4*6*6)
DELTA = -108
DELTA < 0
x in { -1}
x = -1
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