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D( x )
x = 0
x^-4*y^-5 = 0
x = 0
x = 0
x^-4*y^-5 = 0
x^-4*y^-5 = 0
x^-4*y^-5 = 0 // : y^-5
x^-4 = 0
x należy do O
x in (-oo:0) U (0:+oo)
(3*x^-3*y^2)/(x^-4*y^-5) = 0
3*x*y^7 = 0 // : 3*y^7
x = 0
x in { 0}
x belongs to the empty set
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