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D( a )
a = 0
a = 0
a = 0
a in (-oo:0) U (0:+oo)
1/a-((4/3)*a) = 0
(-4/3)*a+1/a = 0
1*a^-1-4/3*a^1 = 0
(1*a^0-4/3*a^2)/(a^1) = 0 // * a^2
a^1*(1*a^0-4/3*a^2) = 0
a^1
(-4/3)*a^2+1 = 0
(-4/3)*a^2+1 = 0
DELTA = 0^2-(1*4*(-4/3))
DELTA = 16/3
DELTA > 0
a = ((16/3)^(1/2)+0)/(2*(-4/3)) or a = (0-(16/3)^(1/2))/(2*(-4/3))
a = -3/8*(16/3)^(1/2) or a = 3/8*(16/3)^(1/2)
a in { -3/8*(16/3)^(1/2), 3/8*(16/3)^(1/2)}
a in { -3/8*(16/3)^(1/2), 3/8*(16/3)^(1/2) }
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