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D( x )
((x^-4*y^2)/(x^5))*y^6 = 0
x^5 = 0
x = 0
((x^-4*y^2)/(x^5))*y^6 = 0
((x^-4*y^2)/(x^5))*y^6 = 0
x^-9*y^8 = 0 // : y^8
x^-9 = 0
x należy do O
x^5 = 0
x^5 = 0
1*x^5 = 0 // : 1
x^5 = 0
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(((x^-4*y^2)/(x^5))*y^6)^-3 = 0
x^27*y^-24 = 0 // : y^-24
x^27 = 0
x = 0
x in { 0}
x belongs to the empty set
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