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D( a )
8*a^-6 = 0
a = 0
8*a^-6 = 0
8*a^-6 = 0
8*a^-6 = 0 // : 8
a^-6 = 0
a należy do O
a = 0
a = 0
a in (-oo:0) U (0:+oo)
((8*a^-6)^-4)/3 = 0
1/12288*a^24 = 0 // : 1/12288
a^24 = 0
a = 0
a in { 0}
a belongs to the empty set
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