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D( x )
6*x^-2*y = 0
x = 0
6*x^-2*y = 0
6*x^-2*y = 0
6*x^-2*y = 0 // : 6*y
x^-2 = 0
x należy do O
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(12*x^7*y^-5)/(6*x^-2*y) = 0
2*x^9*y^-6 = 0 // : 2*y^-6
x^9 = 0
x = 0
x in { 0}
x belongs to the empty set
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