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D( x )
(((x^-1)/4)*y^1)/2 = 0
x = 0
(((x^-1)/4)*y^1)/2 = 0
(((x^-1)/4)*y^1)/2 = 0
(((x^-1)/4)*y)/2 = 0
1/8*x^-1*y = 0 // : 1/8*y
x^-1 = 0
x naleu017Cy do O
x = 0
x = 0
x in (-oo:0) U (0:+oo)
((((x^3)/4)*y^5)/8)/((((x^-1)/4)*y^1)/2) = 0
((((x^3)/4)*y^5)/8)/((((x^-1)/4)*y)/2) = 0
1/4*x^4*y^4 = 0 // : 1/4*y^4
x^4 = 0
x = 0
x in { 0}
x belongs to the empty set
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