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D( x )
x = 0
15*x^-1*y^-2 = 0
x = 0
x = 0
15*x^-1*y^-2 = 0
15*x^-1*y^-2 = 0
15*x^-1*y^-2 = 0 // : 15*y^-2
x^-1 = 0
x należy do O
x in (-oo:0) U (0:+oo)
(5*x^-3*y)/(15*x^-1*y^-2) = 0
1/3*x^-2*y^3 = 0 // : 1/3*y^3
x^-2 = 0
x należy do O
x belongs to the empty set
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