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D( a )
(2*a^4)^2 = 0
4*a^-1 = 0
a = 0
(2*a^4)^2 = 0
(2*a^4)^2 = 0
4*a^8 = 0 // : 4
a^8 = 0
a = 0
4*a^-1 = 0
4*a^-1 = 0
4*a^-1 = 0 // : 4
a^-1 = 0
a należy do O
a = 0
a = 0
a in (-oo:0) U (0:+oo)
((4*a^-1)^-2)/((2*a^4)^2) = 0
1/64*a^-6 = 0 // : 1/64
a^-6 = 0
a należy do O
a belongs to the empty set
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