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D( x )
(x^4*y^2)^-3 = 0
x = 0
x^4*y^2 = 0
(x^4*y^2)^-3 = 0
(x^4*y^2)^-3 = 0
x^-12*y^-6 = 0 // : y^-6
x^-12 = 0
x należy do O
x = 0
x = 0
x^4*y^2 = 0
x^4*y^2 = 0
x^4*y^2 = 0 // : y^2
x^4 = 0
x = 0
x in (-oo:0) U (0:+oo)
(2*x^0*x^2*y^2)/((x^4*y^2)^-3) = 0
(2*x^2*y^2)/((x^4*y^2)^-3) = 0
2*x^14*y^8 = 0 // : 2*y^8
x^14 = 0
x = 0
x in { 0}
x belongs to the empty set
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