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D( x )
x = 0
35*x^5*y^4 = 0
x = 0
x = 0
35*x^5*y^4 = 0
35*x^5*y^4 = 0
35*x^5*y^4 = 0 // : 35*y^4
x^5 = 0
x = 0
x in (-oo:0) U (0:+oo)
(25*x^-3*y^-2)/(35*x^5*y^4) = 0
5/7*x^-8*y^-6 = 0 // : 5/7*y^-6
x^-8 = 0
x należy do O
x belongs to the empty set
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