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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)
4*x-(4/(x^2)) = 0
4*x-4*x^-2 = 0
4*x^1-4*x^-2 = 0
(4*x^3-4*x^0)/(x^2) = 0 // * x^4
x^2*(4*x^3-4*x^0) = 0
x^2
4*x^3-4 = 0
{ 1, -1, 2, -2, 4, -4 }
1
x = 1
4*x^3-4 = 0
1
x-1
4*x^2+4*x+4
4*x^3-4
x-1
4*x^2-4*x^3
4*x^2-4
4*x-4*x^2
4*x-4
4-4*x
0
4*x^2+4*x+4 = 0
DELTA = 4^2-(4*4*4)
DELTA = -48
DELTA < 0
x in { 1}
x = 1
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