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D( x )
x = 0
((2*x^-3)/3)*y^-4 = 0
x = 0
x = 0
((2*x^-3)/3)*y^-4 = 0
((2*x^-3)/3)*y^-4 = 0
2/3*x^-3*y^-4 = 0 // : 2/3*y^-4
x^-3 = 0
x naleu017Cy do O
x in (-oo:0) U (0:+oo)
(((2*x^-3)/3)*y^-4)^-2 = 0
9/4*x^6*y^8 = 0 // : 9/4*y^8
x^6 = 0
x = 0
x in { 0}
x belongs to the empty set
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