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D( x )
x^3 = 0
x^3 = 0
x^3 = 0
1*x^3 = 0 // : 1
x^3 = 0
x = 0
x in (-oo:0) U (0:+oo)
109.2/(x^3) = r // - r
109.2/(x^3)-r = 0
109.2*x^-3 = r // : 109.2
x^-3 = 0.00915751*r
-3 < 0
1/(x^3) = 0.00915751*r // * x^3
1 = 0.00915751*r*x^3 // : 0.00915751*r
109.19998995*r^-1 = x^3
x^3 = 109.19998995*r^-1 // ^ 1/3
x = 109.19998995^(1/3)*r^(-1/3)
x = 109.19998995^(1/3)*r^(-1/3)
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