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Find the sum of the series :tan^- 1(1/3)...

Find the sum of the series :`tan^- 1(1/3)+tan^- 1(2/9)+....+tan^- 1((2^(n-1))/(1+2^(2n-1)))+...... oo`

A

`pi//4`

B

`pi//2`

C

`pi`

D

None of these

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The correct Answer is:
A
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