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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
x-((1/3)*(1/x)) = 0
x+(-1/3)*x^-1 = 0
1*x^1-1/3*x^-1 = 0
(1*x^2-1/3*x^0)/(x^1) = 0 // * x^2
x^1*(1*x^2-1/3*x^0) = 0
x^1
x^2-1/3 = 0
x^2-1/3 = 0
DELTA = 0^2-(1*4*(-1/3))
DELTA = 4/3
DELTA > 0
x = ((4/3)^(1/2)+0)/(1*2) or x = (0-(4/3)^(1/2))/(1*2)
x = ((4/3)^(1/2))/2 or x = (-(4/3)^(1/2))/2
x in { (-(4/3)^(1/2))/2, ((4/3)^(1/2))/2}
x in { (-(4/3)^(1/2))/2, ((4/3)^(1/2))/2 }
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