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D( a )
(a^(1/9))/(4*a^(9/2)) = 0
a < 0
4*a^(9/2) = 0
(a^(1/9))/(4*a^(9/2)) = 0
(a^(1/9))/(4*a^(9/2)) = 0
1/4*a^(-79/18) = 0 // : 1/4
a^(-79/18) = 0
a należy do O
a < 0
4*a^(9/2) = 0
4*a^(9/2) = 0
4*a^(9/2) = 0 // : 4
a^(9/2) = 0
a = 0
a in (0:+oo)
((a^(1/9))/(4*a^(9/2)))^-2 = 0
16*a^(79/9) = 0 // : 16
a^(79/9) = 0
a = 0
a in { 0}
a belongs to the empty set
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