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Sigma(r=1)^ntan^-1(2^(r-1)/(1+2^(2r-1)))...

`Sigma_(r=1)^ntan^-1(2^(r-1)/(1+2^(2r-1)))`=___

A

`tan^-1 2^n`

B

`tan^-1 2^n-pi/4`

C

`tan^-1 2^(n+1)`

D

`tan^-1 2^(n+1)-pi/4`

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