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