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D( x )
x^4+8*x^2+16 = 0
x^4+8*x^2+16 = 0
x^4+8*x^2+16 = 0
t_1 = x^2
1*t_1^2+8*t_1^1+16 = 0
t_1^2+8*t_1+16 = 0
DELTA = 8^2-(1*4*16)
DELTA = 0
t_1 = -8/(1*2)
t_1 = -4 or t_1 = -4
t_1 = -4
x^2+4 = 0
1*x^2 = -4 // : 1
x^2 = -4
t_1 = -4
x^2+4 = 0
1*x^2 = -4 // : 1
x^2 = -4
x in (-oo:+oo)
(8*x)/(x^4+8*x^2+16) = 0
8*x = 0 // : 8
x = 0
x = 0
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