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D( a )
8*a^-2 = 0
a = 0
(2*a^5)^2 = 0
8*a^-2 = 0
8*a^-2 = 0
8*a^-2 = 0 // : 8
a^-2 = 0
a naleu017Cy do O
a = 0
a = 0
(2*a^5)^2 = 0
(2*a^5)^2 = 0
4*a^10 = 0 // : 4
a^10 = 0
a = 0
a in (-oo:0) U (0:+oo)
((8*a^-2)^-3)/((2*a^5)^2) = 0
1/2048*a^-4 = 0 // : 1/2048
a^-4 = 0
a naleu017Cy do O
a belongs to the empty set
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