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D( x )
(2*x^2)^3 = 0
(2*x^2)^3 = 0
(2*x^2)^3 = 0
8*x^6 = 0 // : 8
x^6 = 0
x = 0
x in (-oo:0) U (0:+oo)
12/((2*x^2)^3) = 120 // - 120
12/((2*x^2)^3)-120 = 0
3/2*x^-6 = 120 // : 3/2
x^-6 = 80
-6 < 0
1/(x^6) = 80 // * x^6
1 = 80*x^6 // : 80
1/80 = x^6
x^6 = 1/80 // ^ 1/6
abs(x) = (1/80)^(1/6)
x = (1/80)^(1/6) or x = -(1/80)^(1/6)
x in { (1/80)^(1/6), -(1/80)^(1/6) }
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