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D( x )
x^4*((8*y^8)/2) = 0
x^4*((8*y^8)/2) = 0
x^4*((8*y^8)/2) = 0
4*x^4*y^8 = 0 // : 4*y^8
x^4 = 0
x = 0
x in (-oo:0) U (0:+oo)
(x^4*((8*y^8)/2))^-3 = 0
1/64*x^-12*y^-24 = 0 // : 1/64*y^-24
x^-12 = 0
x naleu017Cy do O
x belongs to the empty set
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