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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)
2*x = 432/(x^2) // - 432/(x^2)
2*x-(432/(x^2)) = 0
2*x-432*x^-2 = 0
2*x^1-432*x^-2 = 0
(2*x^3-432*x^0)/(x^2) = 0 // * x^4
x^2*(2*x^3-432*x^0) = 0
x^2
2*x^3-432 = 0
{ 1, -1, 2, -2, 3, -3, 4, -4, 6, -6, 8, -8, 9, -9, 12, -12, 16, -16, 18, -18, 24, -24, 27, -27, 36, -36, 48, -48, 54, -54, 72, -72, 108, -108, 144, -144, 216, -216, 432, -432 }
1
x = 1
2*x^3-432 = -430
1
-1
x = -1
2*x^3-432 = -434
-1
2
x = 2
2*x^3-432 = -416
2
-2
x = -2
2*x^3-432 = -448
-2
3
x = 3
2*x^3-432 = -378
3
-3
x = -3
2*x^3-432 = -486
-3
4
x = 4
2*x^3-432 = -304
4
-4
x = -4
2*x^3-432 = -560
-4
6
x = 6
2*x^3-432 = 0
6
x-6
2*x^2+12*x+72
2*x^3-432
x-6
12*x^2-2*x^3
12*x^2-432
72*x-12*x^2
72*x-432
432-72*x
0
2*x^2+12*x+72 = 0
DELTA = 12^2-(2*4*72)
DELTA = -432
DELTA < 0
x in { 6}
x = 6
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