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D( x )
8*x = 0
8*x = 0
8*x = 0
8*x = 0 // : 8
x = 0
x in (-oo:0) U (0:+oo)
(2*x^2-1)/(8*x) = 0
2*x^2 = 1 // : 2
x^2 = 1/2
x^2 = 1/2 // ^ 1/2
abs(x) = (1/2)^(1/2)
x = (1/2)^(1/2) or x = -(1/2)^(1/2)
x in { (1/2)^(1/2), -(1/2)^(1/2) }
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