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D( x )
x^6 = 0
x^6 = 0
x^6 = 0
1*x^6 = 0 // : 1
x^6 = 0
x = 0
x in (-oo:0) U (0:+oo)
y = (x^3)/(x^6) // - (x^3)/(x^6)
y-((x^3)/(x^6)) = 0
y-x^-3 = 0
-1*x^-3 = -y // : -1
x^-3 = y
-3 < 0
1/(x^3) = y // * x^3
1 = x^3*y // : y
1/y = x^3
x^3 = 1/y // ^ 1/3
x = 1/(y^(1/3))
x = 1/(y^(1/3))
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