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The sum of the infinite series cot^(-1)2...

The sum of the infinite series `cot^(-1)2 + cot^(-1)8 + cot^(-1)18 + cot^(-1) 32 +.....` is equal to

A

`pi//3`

B

`pi//4`

C

`pi//6`

D

`pi//8`

Text Solution

Verified by Experts

The correct Answer is:
B
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