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