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D( x )
x = 0
((x^-1)/6)*y^6 = 0
x = 0
x = 0
((x^-1)/6)*y^6 = 0
((x^-1)/6)*y^6 = 0
1/6*x^-1*y^6 = 0 // : 1/6*y^6
x^-1 = 0
x należy do O
x in (-oo:0) U (0:+oo)
(((16*x^1)/6)*y^-2)/(((x^-1)/6)*y^6) = 0
(((16*x)/6)*y^-2)/(((x^-1)/6)*y^6) = 0
16*x^2*y^-8 = 0 // : 16*y^-8
x^2 = 0
x = 0
x in { 0}
x belongs to the empty set
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