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D( x )
(w^2*x^2)^3 = 0
(w^2*x^2)^3 = 0
(w^2*x^2)^3 = 0
w^6*x^6 = 0 // : w^6
x^6 = 0
x = 0
x in (-oo:0) U (0:+oo)
((X^2*w)^3)/((w^2*x^2)^3) = 0
X^6*w^-3*x^-6 = 0 // : X^6*w^-3
x^-6 = 0
x należy do O
x belongs to the empty set
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