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D( a )
2*a^3 = 0
2*a^3 = 0
2*a^3 = 0
2*a^3 = 0 // : 2
a^3 = 0
a = 0
a in (-oo:0) U (0:+oo)
(8/(2*a^3))*((3*a^2)/64) = 0
3/16*a^-1 = 0 // : 3/16
a^-1 = 0
a należy do O
a belongs to the empty set
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