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D( a )
a = 0
a = 0
a = 0
a in (-oo:0) U (0:+oo)
a^-1*((4^-4*a^6)/(4^-2)) = 0
1/16*a^5 = 0 // : 1/16
a^5 = 0
a = 0
a in { 0}
a belongs to the empty set
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