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D( x )
4*x^6*y^2 = 0
4*x^6*y^2 = 0
4*x^6*y^2 = 0
4*x^6*y^2 = 0 // : 4*y^2
x^6 = 0
x = 0
x in (-oo:0) U (0:+oo)
(10*x^3*y^7)/(4*x^6*y^2) = 0
5/2*x^-3*y^5 = 0 // : 5/2*y^5
x^-3 = 0
x naleu017Cy do O
x belongs to the empty set
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