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