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x in (-oo:+oo)
(x^4)/4-(8*x^2) = 0
(x^4)/4-8*x^2 = 0
1/4*x^4-8*x^2 = 0
t_1 = x^2
1/4*t_1^2-8*t_1^1 = 0
1/4*t_1^2-8*t_1 = 0
DELTA = (-8)^2-(0*1/4*4)
DELTA = 64
DELTA > 0
t_1 = (64^(1/2)+8)/(1/4*2) or t_1 = (8-64^(1/2))/(1/4*2)
t_1 = 32 or t_1 = 0
t_1 = 0
x^2+0 = 0
x^2 = 0
1*x^2 = 0 // : 1
x^2 = 0
x = 0
t_1 = 32
x^2-32 = 0
1*x^2 = 32 // : 1
x^2 = 32
x^2 = 32 // ^ 1/2
abs(x) = 4*2^(1/2)
x = 4*2^(1/2) or x = -(4*2^(1/2))
x in { 0, 4*2^(1/2), -(4*2^(1/2)) }
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