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Sigma(r=1)^n sin^-1((sqrtr-sqrt(r-1))/(s...

`Sigma_(r=1)^n sin^-1((sqrtr-sqrt(r-1))/(sqrtr(r+1)))`=_______

A

`tan^-1 sqrtn-pi/4`

B

`tan^-1 sqrt(n+1)-pi/4`

C

`tan^-1sqrtn`

D

`tan^-1sqrt(n+1)`

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