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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-(2048/(x^2)) = 0
4*x-2048*x^-2 = 0
4*x^1-2048*x^-2 = 0
(4*x^3-2048*x^0)/(x^2) = 0 // * x^4
x^2*(4*x^3-2048*x^0) = 0
x^2
4*x^3-2048 = 0
{ 1, -1, 2, -2, 4, -4, 8, -8, 16, -16, 32, -32, 64, -64, 128, -128, 256, -256, 512, -512, 1024, -1024, 2048, -2048 }
1
x = 1
4*x^3-2048 = -2044
1
-1
x = -1
4*x^3-2048 = -2052
-1
2
x = 2
4*x^3-2048 = -2016
2
-2
x = -2
4*x^3-2048 = -2080
-2
4
x = 4
4*x^3-2048 = -1792
4
-4
x = -4
4*x^3-2048 = -2304
-4
8
x = 8
4*x^3-2048 = 0
8
x-8
4*x^2+32*x+256
4*x^3-2048
x-8
32*x^2-4*x^3
32*x^2-2048
256*x-32*x^2
256*x-2048
2048-256*x
0
4*x^2+32*x+256 = 0
DELTA = 32^2-(4*4*256)
DELTA = -3072
DELTA < 0
x in { 8}
x = 8
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