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