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D( x )
(x^-2*y^4)^4 = 0
x = 0
(x^-2*y^4)^4 = 0
(x^-2*y^4)^4 = 0
x^-8*y^16 = 0 // : y^16
x^-8 = 0
x należy do O
x = 0
x = 0
x in (-oo:0) U (0:+oo)
((x^5*y^-3)^2)/((x^-2*y^4)^4) = 0
x^18*y^-22 = 0 // : y^-22
x^18 = 0
x = 0
x in { 0}
x belongs to the empty set
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