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