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D( a )
(2*a)^2 = 0
(2*a)^2 = 0
(2*a)^2 = 0
4*a^2 = 0 // : 4
a^2 = 0
a = 0
a in (-oo:0) U (0:+oo)
(24*a^2)/((2*a)^2) = 0
6 = 0
a belongs to the empty set
a belongs to the empty set
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