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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)
36*x-(36/(x^2)) = 0
36*x-36*x^-2 = 0
36*x^1-36*x^-2 = 0
(36*x^3-36*x^0)/(x^2) = 0 // * x^4
x^2*(36*x^3-36*x^0) = 0
x^2
36*x^3-36 = 0
{ 1, -1, 2, -2, 3, -3, 4, -4, 6, -6, 9, -9, 12, -12, 18, -18, 36, -36 }
1
x = 1
36*x^3-36 = 0
1
x-1
36*x^2+36*x+36
36*x^3-36
x-1
36*x^2-36*x^3
36*x^2-36
36*x-36*x^2
36*x-36
36-36*x
0
36*x^2+36*x+36 = 0
DELTA = 36^2-(4*36*36)
DELTA = -3888
DELTA < 0
x in { 1}
x = 1
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