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D( x )
((3*x^2)/3)*x^2+x^2 = 0
((3*x^2)/3)*x^2+x^2 = 0
((3*x^2)/3)*x^2+x^2 = 0
x^4+x^2 = 0
t_1 = x^2
1*t_1^2+1*t_1^1 = 0
t_1^2+t_1 = 0
DELTA = 1^2-(0*1*4)
DELTA = 1
DELTA > 0
t_1 = (1^(1/2)-1)/(1*2) or t_1 = (-1^(1/2)-1)/(1*2)
t_1 = 0 or t_1 = -1
t_1 = -1
x^2+1 = 0
1*x^2 = -1 // : 1
x^2 = -1
t_1 = 0
x^2+0 = 0
x^2 = 0
1*x^2 = 0 // : 1
x^2 = 0
x = 0
x in (-oo:0) U (0:+oo)
(3*x+(9/2)*x)/(((3*x^2)/3)*x^2+x^2) = 0
(15/2*x)/(x^4+x^2) = 0
x^4+x^2 = 0
x^2*(x^2+1) = 0
1*x^2 = -1 // : 1
x^2 = -1
x^2 = 0
(15/2*x)/(x^2) = 0
15/2*x = 0 // : 15/2
x = 0
x in { 0}
x belongs to the empty set
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