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