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D( x )
(4*x^6)/y = 0
(4*x^6)/y = 0
(4*x^6)/y = 0
4*x^6*y^-1 = 0 // : 4*y^-1
x^6 = 0
x = 0
x in (-oo:0) U (0:+oo)
((4*x^6)/y)^-3 = 0
1/64*x^-18*y^3 = 0 // : 1/64*y^3
x^-18 = 0
x należy do O
x belongs to the empty set
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