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D( x )
(x-1)*(x^2+1) = 0
(x-1)*(x^2+1) = 0
(x-1)*(x^2+1) = 0
( x-1 )
x-1 = 0 // + 1
x = 1
( x^2+1 )
1*x^2 = -1 // : 1
x^2 = -1
x in (-oo:1) U (1:+oo)
(4*x)/((x-1)*(x^2+1)) = 0
4*x = 0 // : 4
x = 0
x = 0
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