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D( a )
a = 0
a^0 = 0
a = 0
a = 0
a^0 = 0
a^0 = 0
1 = 0
a^0 = 0
1 = 0
a belongs to the empty set
a in (-oo:0) U (0:+oo)
(6*a^3)/(a^0) = 0
6*a^3 = 0
6*a^3 = 0 // : 6
a^3 = 0
a = 0
a in { 0}
a belongs to the empty set
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