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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)
1/(x^3) = 64 // - 64
1/(x^3)-64 = 0
1*x^-3 = 64 // : 1
x^-3 = 64
-3 < 0
1/(x^3) = 64 // * x^3
1 = 64*x^3 // : 64
1/64 = x^3
x^3 = 1/64 // ^ 1/3
x = 1/4
x = 1/4
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