MCQOPTIONS
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| 1. |
The coefficient of \[x\] in the expansion of \[{{[\sqrt{1+{{x}^{2}}}-x]}^{-1}}\]in ascending powers of x, when \[|x| |
| A. | 0 |
| B. | \[\frac{1}{2}\] |
| C. | \[-\frac{1}{2}\] |
| D. | 1 |
| Answer» E. | |