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D( a )
4*a^5 = 0
4*a^5 = 0
4*a^5 = 0
4*a^5 = 0 // : 4
a^5 = 0
a = 0
a in (-oo:0) U (0:+oo)
(16*a^8)/(4*a^5) = 0
4*a^3 = 0 // : 4
a^3 = 0
a = 0
a in { 0}
a belongs to the empty set
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