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D( a )
a^2 = 0
a^2 = 0
a^2 = 0
1*a^2 = 0 // : 1
a^2 = 0
a = 0
a in (-oo:0) U (0:+oo)
4 = 3/(a^2) // - 3/(a^2)
4-(3/(a^2)) = 0
4-3*a^-2 = 0
-3*a^-2 = -4 // : -3
a^-2 = 4/3
-2 < 0
1/(a^2) = 4/3 // * a^2
1 = 4/3*a^2 // : 4/3
3/4 = a^2
a^2 = 3/4 // ^ 1/2
abs(a) = (3/4)^(1/2)
a = (3/4)^(1/2) or a = -(3/4)^(1/2)
a in { (3/4)^(1/2), -(3/4)^(1/2) }
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