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D( x )
((2*x^3)/(4^-1))*y^-1 = 0
((2*x^3)/(4^-1))*y^-1 = 0
((2*x^3)/(4^-1))*y^-1 = 0
8*x^3*y^-1 = 0 // : 8*y^-1
x^3 = 0
x = 0
x in (-oo:0) U (0:+oo)
(((2*x^3)/(4^-1))*y^-1)^-2 = 0
1/64*x^-6*y^2 = 0 // : 1/64*y^2
x^-6 = 0
x należy do O
x belongs to the empty set
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