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