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D( x )
x = 0
(x^-2*y^2)^1 = 0
x = 0
x = 0
(x^-2*y^2)^1 = 0
(x^-2*y^2)^1 = 0
x^-2*y^2 = 0
x^-2*y^2 = 0 // : y^2
x^-2 = 0
x należy do O
x in (-oo:0) U (0:+oo)
((x^4*y^-6)/((x^-2*y^2)^1))/2 = 0
((x^4*y^-6)/(x^-2*y^2))/2 = 0
1/2*x^6*y^-8 = 0 // : 1/2*y^-8
x^6 = 0
x = 0
x in { 0}
x belongs to the empty set
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