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D( x )
x^4+32*x^2+256 = 0
x^4+32*x^2+256 = 0
x^4+32*x^2+256 = 0
t_1 = x^2
1*t_1^2+32*t_1^1+256 = 0
t_1^2+32*t_1+256 = 0
DELTA = 32^2-(1*4*256)
DELTA = 0
t_1 = -32/(1*2)
t_1 = -16 or t_1 = -16
t_1 = -16
x^2+16 = 0
1*x^2 = -16 // : 1
x^2 = -16
t_1 = -16
x^2+16 = 0
1*x^2 = -16 // : 1
x^2 = -16
x in (-oo:+oo)
-((x^2)/(x^4+32*x^2+256)) = 0
(-1*x^2)/(x^4+32*x^2+256) = 0
1*x^2 = 0 // : 1
x^2 = 0
x = 0
x = 0
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