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--------- x --------- = ------------ x ------------ =
(x+3)(x+1) 3(x²-x+1) (x+3)(x+1) 3{(x-1)(x+2)}
(x³+1) 1 x³+1 x³+1
--------- x ---------- = -----------------------=-----------------=
(x+1) (x-1)(x+2) (x+1){(x-1)(x+2)} (x+1)x²+x-2
x³+1 x³+1
----------------------= -------------------
x³+x²-2x+x²+x-2 x³+2x²-x-2