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D( a )
(4*a)^-3 = 0
4*a = 0
(4*a)^-3 = 0
(4*a)^-3 = 0
1/64*a^-3 = 0 // : 1/64
a^-3 = 0
a naleu017Cy do O
4*a = 0
4*a = 0
4*a = 0 // : 4
a = 0
a in (-oo:0) U (0:+oo)
(16^-2)/((4*a)^-3) = 0
1/4*a^3 = 0 // : 1/4
a^3 = 0
a = 0
a in { 0}
a belongs to the empty set
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