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The coefficient of x in the expansion of...

The coefficient of `x` in the expansion of `{sqrt(1+x^2)-x}^(-1)` in ascending powers of `x ,` when `|x|<1,i s` a. `1` b. `1/2` c. `-1/2` d. `-1/8`

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CENGAGE PUBLICATION-BINOMIAL THEOREM-All Questions
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