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D( s )
s^2 = 0
s^2 = 0
s^2 = 0
1*s^2 = 0 // : 1
s^2 = 0
s = 0
s in (-oo:0) U (0:+oo)
2*s-(1024/(s^2)) = 0
2*s-1024*s^-2 = 0
2*s^1-1024*s^-2 = 0
(2*s^3-1024*s^0)/(s^2) = 0 // * s^4
s^2*(2*s^3-1024*s^0) = 0
s^2
2*s^3-1024 = 0
{ 1, -1, 2, -2, 4, -4, 8, -8, 16, -16, 32, -32, 64, -64, 128, -128, 256, -256, 512, -512, 1024, -1024 }
1
s = 1
2*s^3-1024 = -1022
1
-1
s = -1
2*s^3-1024 = -1026
-1
2
s = 2
2*s^3-1024 = -1008
2
-2
s = -2
2*s^3-1024 = -1040
-2
4
s = 4
2*s^3-1024 = -896
4
-4
s = -4
2*s^3-1024 = -1152
-4
8
s = 8
2*s^3-1024 = 0
8
s-8
2*s^2+16*s+128
2*s^3-1024
s-8
16*s^2-2*s^3
16*s^2-1024
128*s-16*s^2
128*s-1024
1024-128*s
0
2*s^2+16*s+128 = 0
DELTA = 16^2-(2*4*128)
DELTA = -768
DELTA < 0
s in { 8}
s = 8
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