- coefficient of \( x^{5} \) in the expansion of \[ \frac{1+x^{2}}{1+x},|x|1 \] (A) \( -1 \) (B)...

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- coefficient of \( x^{5} \) in the expansion of
\[
\frac{1+x^{2}}{1+x},|x|1
\]
(A) \( -1 \)
(B) 2
(C) \( -2 \)
(D) undefined
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