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