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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
x^2-x-(12/x)-2 = 0
x^2-x-12*x^-1-2 = 0
1*x^2-1*x^1-12*x^-1-2*x^0 = 0
(1*x^3-1*x^2-2*x^1-12*x^0)/(x^1) = 0 // * x^2
x^1*(1*x^3-1*x^2-2*x^1-12*x^0) = 0
x^1
x^3-x^2-2*x-12 = 0
{ 1, -1, 2, -2, 3, -3, 4, -4, 6, -6, 12, -12 }
1
x = 1
x^3-x^2-2*x-12 = -14
1
-1
x = -1
x^3-x^2-2*x-12 = -12
-1
2
x = 2
x^3-x^2-2*x-12 = -12
2
-2
x = -2
x^3-x^2-2*x-12 = -20
-2
3
x = 3
x^3-x^2-2*x-12 = 0
3
x-3
x^2+2*x+4
x^3-x^2-2*x-12
x-3
3*x^2-x^3
2*x^2-2*x-12
6*x-2*x^2
4*x-12
12-4*x
0
x^2+2*x+4 = 0
DELTA = 2^2-(1*4*4)
DELTA = -12
DELTA < 0
x in { 3}
x = 3
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