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if ngt1and I=int0^infty dx/((x+sqrt(1+x^...

if `ngt1`and `I=int_0^infty dx/((x+sqrt(1+x^2))^n` then I equals

A

`n/(n^2-1)`

B

`2n/(n^2-1)`

C

`n/(2(n^2-1)`

D

`sqrtn^2-1`

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The correct Answer is:
A
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