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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] lt 1`, is

A

a) 0

B

b) `(1)/(2)`

C

c) `-(1)/(2)`

D

d) 1

Text Solution

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The correct Answer is:
D
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