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D( A )
A = 0
A = 0
A = 0
A in (-oo:0) U (0:+oo)
1/3-(A/3)-((1/A)/3) = 0
(-1/3)*A^-1-(A/3)+1/3 = 0
1/3*A^0-1/3*A^1-1/3*A^-1 = 0
(1/3*A^1-1/3*A^2-1/3*A^0)/(A^1) = 0 // * A^2
A^1*(1/3*A^1-1/3*A^2-1/3*A^0) = 0
A^1
(-1/3)*A^2+(1/3)*A-1/3 = 0
(-1/3)*A^2+(1/3)*A-1/3 = 0
DELTA = (1/3)^2-(4*(-1/3)*(-1/3))
DELTA = -1/3
DELTA < 0
A in { }
A belongs to the empty set
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