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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)
(((16*x^6)^1)/2)/(x^4) = 0
((16*x^6)/2)/(x^4) = 0
8*x^2 = 0 // : 8
x^2 = 0
x = 0
x in { 0}
x belongs to the empty set
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