X/(x^2+1)(x-1)(x+2)
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PuttinS x l,in (1) x(4xll.(x-lJC(xz U 1_(.4x1 I B)(1 1) I C(lz I 1) 1(.4B)xOC(ll) 1_0 1 ZC c1 z Puttingx:O,hii: x (.4x I7)(x _ l) C(x2 l) 0(4xOB)(O-1)C(Ol) 0; 0(-1)C B C ' 2
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