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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(1/2)*x^-8 = 16 // - 16
(1/2)*x^-8-16 = 0
1/2*x^-8 = 16 // : 1/2
x^-8 = 32
-8 < 0
1/(x^8) = 32 // * x^8
1 = 32*x^8 // : 32
1/32 = x^8
x^8 = 1/32 // ^ 1/8
abs(x) = (1/32)^(1/8)
x = (1/32)^(1/8) or x = -(1/32)^(1/8)
x in { (1/32)^(1/8), -(1/32)^(1/8) }
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