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D( a )
a = 0
4*a = 0
a = 0
a = 0
4*a = 0
4*a = 0
4*a = 0 // : 4
a = 0
a in (-oo:0) U (0:+oo)
(1*(4*a)^-2*(2*a)^3)/a = 0
((4*a)^-2*(2*a)^3)/a = 0
1/2 = 0
a belongs to the empty set
a belongs to the empty set
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