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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(1/3)*((x^-3)/4) = (-8/9)*((x^-5)/3) // - (-8/9)*((x^-5)/3)
(1/3)*((x^-3)/4)-((-8/9)*((x^-5)/3)) = 0
(1/3)*((x^-3)/4)+(8/27)*x^-5 = 0
1/12*x^-3+8/27*x^-5 = 0
(1/12*x^2+8/27*x^0)/(x^5) = 0 // * x^10
x^5*(1/12*x^2+8/27*x^0) = 0
x^5
(1/12)*x^2+8/27 = 0
(1/12)*x^2+8/27 = 0
DELTA = 0^2-(4*(1/12)*(8/27))
DELTA = -8/81
DELTA < 0
x in { }
x belongs to the empty set
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