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D( a )
2*a^2 = 0
(2*a^-2)^3 = 0
a = 0
2*a^2 = 0
2*a^2 = 0
2*a^2 = 0 // : 2
a^2 = 0
a = 0
(2*a^-2)^3 = 0
(2*a^-2)^3 = 0
8*a^-6 = 0 // : 8
a^-6 = 0
a należy do O
a = 0
a = 0
a in (-oo:0) U (0:+oo)
((4*a^-4)^3*(2*a^2)^-3)/((2*a^-2)^3) = 0
1*a^-12 = 0 // : 1
a^-12 = 0
a należy do O
a belongs to the empty set
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