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D( x )
1-(8*x^2) = 0
1-(8*x^2) < 0
1-(8*x^2) = 0
1-(8*x^2) = 0
1-8*x^2 = 0
-8*x^2 = -1 // : -8
x^2 = 1/8
x^2 = 1/8 // ^ 1/2
abs(x) = (1/8)^(1/2)
x = (1/8)^(1/2) or x = -(1/8)^(1/2)
1-(8*x^2) < 0
1-(8*x^2) < 0
1-8*x^2 < 0
-8*x^2 < -1
-8*x^2 < -1 // * -1
8*x^2 > 1
8*x^2 > 1 // : 8
x^2 > 1/8
x^2 > 1/8 // ^ 1/2
abs(x) > (1/8)^(1/2)
x in (-oo:-(1/8)^(1/2)) U ((1/8)^(1/2):+oo)
x in (-(1/8)^(1/2):(1/8)^(1/2))
(1-(8*x^2))^(-3/4) = 0
(1-8*x^2)^(-3/4) = 0
1/((1-8*x^2)^(3/4)) = 0
x belongs to the empty set
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