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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)
x/(x^2)-(6*x) = 0
x/(x^2)-6*x = 0
1*x^-1-6*x^1 = 0
(1*x^0-6*x^2)/(x^1) = 0 // * x^2
x^1*(1*x^0-6*x^2) = 0
x^1
1-6*x^2 = 0
1-6*x^2 = 0
DELTA = 0^2-(-6*1*4)
DELTA = 24
DELTA > 0
x = (24^(1/2)+0)/(-6*2) or x = (0-24^(1/2))/(-6*2)
x = (-6^(1/2))/6 or x = (1*6^(1/2))/6
x in { (-6^(1/2))/6, (1*6^(1/2))/6}
x in { (-6^(1/2))/6, (1*6^(1/2))/6 }
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