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D( x )
10*x^8*y^2 = 0
10*x^8*y^2 = 0
10*x^8*y^2 = 0
10*x^8*y^2 = 0 // : 10*y^2
x^8 = 0
x = 0
x in (-oo:0) U (0:+oo)
(5*x^3*y^5)/(10*x^8*y^2) = 0
1/2*x^-5*y^3 = 0 // : 1/2*y^3
x^-5 = 0
x naleu017Cy do O
x belongs to the empty set
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