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D( x )
(((9*x^9)/2)*y^3)^2 = 0
(((9*x^9)/2)*y^3)^2 = 0
(((9*x^9)/2)*y^3)^2 = 0
81/4*x^18*y^6 = 0 // : 81/4*y^6
x^18 = 0
x = 0
x in (-oo:0) U (0:+oo)
(((x^8*y^-1)/2)^2)/((((9*x^9)/2)*y^3)^2) = 0
1/81*x^-2*y^-8 = 0 // : 1/81*y^-8
x^-2 = 0
x naleu017Cy do O
x belongs to the empty set
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