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D( x )
(3*x^6*y^-5)/(6*x^-6*y^5) = 0
x = 0
6*x^-6*y^5 = 0
(3*x^6*y^-5)/(6*x^-6*y^5) = 0
(3*x^6*y^-5)/(6*x^-6*y^5) = 0
1/2*x^12*y^-10 = 0 // : 1/2*y^-10
x^12 = 0
x = 0
x = 0
x = 0
6*x^-6*y^5 = 0
6*x^-6*y^5 = 0
6*x^-6*y^5 = 0 // : 6*y^5
x^-6 = 0
x naleu017Cy do O
x in (-oo:0) U (0:+oo)
((3*x^6*y^-5)/(6*x^-6*y^5))^-2 = 0
4*x^-24*y^20 = 0 // : 4*y^20
x^-24 = 0
x naleu017Cy do O
x belongs to the empty set
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