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