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D( x )
((a^8)/4)*b^-4 < 0
((a^8)/4)*b^-4 < 0
((a^8)/4)*b^-4 < 0
1/4*a^8*b^-4 < 0
x naleu017Cy do R
x belongs to the empty set
(((a^8)/4)*b^-4)^(1/2) = 0
x belongs to the empty set
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