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D( a )
(4*a^-2)/5 = 0
(a^4)/((4*a^-2)/5) = 0
a = 0
(4*a^-2)/5 = 0
(4*a^-2)/5 = 0
4/5*a^-2 = 0 // : 4/5
a^-2 = 0
a należy do O
(a^4)/((4*a^-2)/5) = 0
(a^4)/((4*a^-2)/5) = 0
5/4*a^6 = 0 // : 5/4
a^6 = 0
a = 0
a = 0
a = 0
a in (-oo:0) U (0:+oo)
((a^4)/((4*a^-2)/5))^-3 = 0
64/125*a^-18 = 0 // : 64/125
a^-18 = 0
a należy do O
a belongs to the empty set
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