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D( a )
4*a^(5/3) < 0
4*a^(5/3) < 0
4*a^(5/3) < 0
4*a^(5/3) < 0
4*a^(5/3) < 0 // : 4
a^(5/3) < 0/4
a^(5/3) < 0
a >= 0
a belongs to the empty set
a in (-oo:+oo)
(4*a^(5/3))^(3/2) = 0
8*a^(5/2) = 0 // : 8
a^(5/2) = 0
a = 0
a = 0
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