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D( a )
(a^2)^2 = 0
a^2 = 0
(a^2)^2 = 0
(a^2)^2 = 0
1*a^4 = 0 // : 1
a^4 = 0
a = 0
a^2 = 0
a^2 = 0
1*a^2 = 0 // : 1
a^2 = 0
a = 0
a in (-oo:0) U (0:+oo)
((5/(a^2))^2)/((a^2)^2) = 0
25*a^-8 = 0 // : 25
a^-8 = 0
a naleu017Cy do O
a belongs to the empty set
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