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D( x )
9*x^6*y^2 = 0
4*y = 0
9*x^6*y^2 = 0
9*x^6*y^2 = 0
9*x^6*y^2 = 0 // : 9*y^2
x^6 = 0
x = 0
4*y = 0
4*y = 0
4*y = 0
x naleu017Cy do R
x belongs to the empty set
((6*x^3)/(9*x^6*y^2))*((18*x^4*y^7)/(4*y)) = 0
x belongs to the empty set
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