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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
x^3*((1-(2*(1/x)))/2) = 0
x^3*((1-2*x^-1)/2) = 0
(x^3*(1-2*x^-1))/2 = 0
( 1-2*x^-1 )
-2*x^-1 = -1 // : -2
x^-1 = 1/2
-1 < 0
1/(x^1) = 1/2 // * x^1
1 = 1/2*x^1 // : 1/2
2 = x^1
x = 2
( x^3 )
1*x^3 = 0 // : 1
x^3 = 0
x = 0
x in { 0}
x = 2
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