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D( a )
16*a^2 = 0
(8*a*a^2)/12 = 0
16*a^2 = 0
16*a^2 = 0
16*a^2 = 0 // : 16
a^2 = 0
a = 0
(8*a*a^2)/12 = 0
(8*a*a^2)/12 = 0
2/3*a^3 = 0 // : 2/3
a^3 = 0
a = 0
a in (-oo:0) U (0:+oo)
(6*a*a^2*((6*a*a^2+8)/(16*a^2)))/((8*a*a^2)/12) = 0
(6*a^3*(6*a^3+8))/(2/3*16*a^2*a^3) = 0
( 6*a^3+8 )
6*a^3 = -8 // : 6
a^3 = -4/3
a^3 = -4/3 // ^ 1/3
a = -(4/3)^(1/3)
( 6*a^3 )
6*a^3 = 0 // : 6
a^3 = 0
a = 0
a in { 0}
a = -(4/3)^(1/3)
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