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