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