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D( x )
x = 0
(5*x^-2)/(6*y^-2) = 0
6*y^-2 = 0
x = 0
x = 0
(5*x^-2)/(6*y^-2) = 0
(5*x^-2)/(6*y^-2) = 0
5/6*x^-2*y^2 = 0 // : 5/6*y^2
x^-2 = 0
x należy do O
6*y^-2 = 0
6*y^-2 = 0
6*y^-2 = 0
x należy do R
x belongs to the empty set
((5*x^-2)/(6*y^-2))^-3 = 0
x belongs to the empty set
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