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D( x )
8*x^-2*y = 0
2*x^-2*y^-1 = 0
x = 0
8*x^-2*y = 0
8*x^-2*y = 0
8*x^-2*y = 0 // : 8*y
x^-2 = 0
x należy do O
2*x^-2*y^-1 = 0
2*x^-2*y^-1 = 0
2*x^-2*y^-1 = 0 // : 2*y^-1
x^-2 = 0
x należy do O
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(3*x^-8*y^-2*(2*x^-2*y^-1)^-3)/(8*x^-2*y)-2 = 0
-125/64 = 0
x belongs to the empty set
x belongs to the empty set
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