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D( x )
(6*x^6)/y = 0
(6*x^6)/y = 0
(6*x^6)/y = 0
6*x^6*y^-1 = 0 // : 6*y^-1
x^6 = 0
x = 0
x in (-oo:0) U (0:+oo)
((6*x^6)/y)^-2 = 0
1/36*x^-12*y^2 = 0 // : 1/36*y^2
x^-12 = 0
x należy do O
x belongs to the empty set
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