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If f(x)=lim(n->oo)((x^2+a x+1)+x^(2n)(2x...

If `f(x)=lim_(n->oo)((x^2+a x+1)+x^(2n)(2x^2+x+b))/(1+x^(2n))and lim_(x->+-1)f(x)` exist, then The value of `b` is (a)`-1` (b). 1 ( c.) `0` (d).`2`

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