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D( x )
(4*a^-2)^3 = 0
(4*a^-2)^3 = 0
(4*a^-2)^3 = 0
64*a^-6 = 0
x należy do R
x belongs to the empty set
(64*a^-12*z^4)/((4*a^-2)^3) = 0
x belongs to the empty set
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