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