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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
2/x-(2*x) = 0
2/x-2*x = 0
2*x^-1-2*x^1 = 0
(2*x^0-2*x^2)/(x^1) = 0 // * x^2
x^1*(2*x^0-2*x^2) = 0
x^1
2-2*x^2 = 0
2-2*x^2 = 0
DELTA = 0^2-(-2*2*4)
DELTA = 16
DELTA > 0
x = (16^(1/2)+0)/(-2*2) or x = (0-16^(1/2))/(-2*2)
x = -1 or x = 1
x in { -1, 1}
x in { -1, 1 }
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