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