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Find-the-coefficient-of-x-in-the-expansion-of-1-x-2-x-1-in-ascending-power-of-x-when-x-lt-1-

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Question Number 22517 by Tinkutara last updated on 19/Oct/17
Find the coefficient of x in the expansion of [(√(1 + x^2 )) − x]^(−1) in ascending power of x when ∣x∣ < 1.
Findthecoefficientofxintheexpansionof[1+x2−x]−1inascendingpowerofxwhen∣x∣<1.

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