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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)
0 = 6*x-(48/(x^3)) // - 6*x-(48/(x^3))
48/(x^3)-(6*x)+0 = 0
48/(x^3)-6*x = 0
48*x^-3-6*x = 0
6*x*(8*x^-4-1) = 0
8*x^-4 = 1 // : 8
x^-4 = 1/8
-4 < 0
1/(x^4) = 1/8 // * x^4
1 = 1/8*x^4 // : 1/8
8 = x^4
x^4 = 8 // ^ 1/4
abs(x) = 8^(1/4)
x = 8^(1/4) or x = -8^(1/4)
6*x = 0
6*x = 0 // : 6
x = 0
x in { 0}
x in { 8^(1/4), -8^(1/4) }
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