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D( x )
8*x^-2*y = 0
x = 0
(8*x^-2*y)^-2 = 0
8*x^-2*y = 0
8*x^-2*y = 0
8*x^-2*y = 0 // : 8*y
x^-2 = 0
x naleu017Cy do O
x = 0
x = 0
(8*x^-2*y)^-2 = 0
(8*x^-2*y)^-2 = 0
1/64*x^4*y^-2 = 0 // : 1/64*y^-2
x^4 = 0
x = 0
x in (-oo:0) U (0:+oo)
(2*3*x^-8*x^-2*y^-2*y^2)/((8*x^-2*y)^-2) = 0
384*x^-14*y^2 = 0 // : 384*y^2
x^-14 = 0
x naleu017Cy do O
x belongs to the empty set
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