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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
((8^-4*x^-8)^1)/4 = 0
(8^-4*x^-8)/4 = 0
1/16384*x^-8 = 0 // : 1/16384
x^-8 = 0
x naleu017Cy do O
x belongs to the empty set
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