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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+4*x^2 = 0
t_1 = x^2
10*t_1^3+4*t_1^1 = 0
10*t_1^3+4*t_1 = 0
2*t_1*(5*t_1^2+2) = 0
5*t_1^2 = -2 // : 5
t_1^2 = -2/5
2*t_1 = 0
2*t_1 = 0 // : 2
t_1 = 0
t_1 = 0
x^2+0 = 0
x^2 = 0
1*x^2 = 0 // : 1
x^2 = 0
x = 0
x in { 0}
x belongs to the empty set
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