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D( a )
8*a^5 = 0
8*a^5 = 0
8*a^5 = 0
8*a^5 = 0 // : 8
a^5 = 0
a = 0
a in (-oo:0) U (0:+oo)
(6*a^2)/(8*a^5) = 0
3/4*a^-3 = 0 // : 3/4
a^-3 = 0
a należy do O
a belongs to the empty set
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