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D( x )
(2*x^2)^2 = 0
(2*x^2)^2 = 0
(2*x^2)^2 = 0
4*x^4 = 0 // : 4
x^4 = 0
x = 0
x in (-oo:0) U (0:+oo)
x-(2/((2*x^2)^2)) = 0
x-2*(2*x^2)^-2 = 0
x-1/2*x^-4 = 0
x*(1-1/2*x^-5) = 0
-1/2*x^-5 = -1 // : -1/2
x^-5 = 2
-5 < 0
1/(x^5) = 2 // * x^5
1 = 2*x^5 // : 2
1/2 = x^5
x^5 = 1/2 // ^ 1/5
x = (1/2)^(1/5)
x = 0
x = 0
x in { 0}
x = (1/2)^(1/5)
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