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