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D( x )
(3*x^4)/y = 0
(3*x^4)/y = 0
(3*x^4)/y = 0
3*x^4*y^-1 = 0 // : 3*y^-1
x^4 = 0
x = 0
x in (-oo:0) U (0:+oo)
((3*x^4)/y)^-3 = 0
1/27*x^-12*y^3 = 0 // : 1/27*y^3
x^-12 = 0
x należy do O
x belongs to the empty set
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