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D( x )
x = 0
x^-7 = 0
x = 0
x = 0
x^-7 = 0
x^-7 = 0
1*x^-7 = 0 // : 1
x^-7 = 0
x należy do O
x in (-oo:0) U (0:+oo)
((((((X^1)/2)*y^-2)/(x^-7))/4)*y)^6 = 0
(((((X/2)*y^-2)/(x^-7))/4)*y)^6 = 0
1/262144*X^6*x^42*y^-6 = 0 // : 1/262144*X^6*y^-6
x^42 = 0
x = 0
x in { 0}
x belongs to the empty set
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