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D( x )
2*x^2 = 0
2*x^2 = 0
2*x^2 = 0
2*x^2 = 0 // : 2
x^2 = 0
x = 0
x in (-oo:0) U (0:+oo)
(10*x^6+8*x^4)/(2*x^2) = 0
10*x^6+8*x^4 = 0
2*x^4*(5*x^2+4) = 0
5*x^2 = -4 // : 5
x^2 = -4/5
2*x^4 = 0
(2*x^4)/(2*x^2) = 0
2*x^4 = 0 // : 2
x^4 = 0
x = 0
x in { 0}
x belongs to the empty set
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