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D( x )
x = 0
x^-2 = 0
x = 0
x = 0
x^-2 = 0
x^-2 = 0
1*x^-2 = 0 // : 1
x^-2 = 0
x naleu017Cy do O
x in (-oo:0) U (0:+oo)
((((x^6*y^-3)/(x^-2))*y^5)^1)/2 = 0
(((x^6*y^-3)/(x^-2))*y^5)/2 = 0
1/2*x^8*y^2 = 0 // : 1/2*y^2
x^8 = 0
x = 0
x in { 0}
x belongs to the empty set
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