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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
6*x = -(-1/x) // + -1/x
6*x-1/x = 0
6*x^1-1*x^-1 = 0
(6*x^2-1*x^0)/(x^1) = 0 // * x^2
x^1*(6*x^2-1*x^0) = 0
x^1
6*x^2-1 = 0
6*x^2-1 = 0
DELTA = 0^2-(-1*4*6)
DELTA = 24
DELTA > 0
x = (24^(1/2)+0)/(2*6) or x = (0-24^(1/2))/(2*6)
x = (1*6^(1/2))/6 or x = (-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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