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The sum underset(n=1) overset(infty) Sig...

The sum `underset(n=1) overset(infty) Sigma tan^(-1) ((4n)/( n^(4) - 2n^(2) +2))` is equal to

A

`tan^(-1)2+tan^(-1)3`

B

`4tan^(-1)1`

C

`pi//2`

D

`sec^(-1)(-sqrt(2))`

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The correct Answer is:
A, D
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