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D( x )
x^2 = 0
x^2 = 0
x^2 = 0
1*x^2 = 0 // : 1
x^2 = 0
x = 0
x in (-oo:0) U (0:+oo)
(3/2)*x = (1/4)*x-(1/(x^2)) // - (1/4)*x-(1/(x^2))
(3/2)*x-((1/4)*x)+1/(x^2) = 0
(3/2)*x+(-1/4)*x+1/(x^2) = 0
5/4*x+x^-2 = 0
x*(x^-3+5/4) = 0
1*x^-3 = -5/4 // : 1
x^-3 = -5/4
-3 < 0
1/(x^3) = -5/4 // * x^3
1 = -5/4*x^3 // : -5/4
-4/5 = x^3
x^3 = -4/5 // ^ 1/3
x = -(4/5)^(1/3)
x = 0
x = 0
x in { 0}
x = -(4/5)^(1/3)
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