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lim(n to oo)Sigma (r=1)^n tan^-1(1/(2r^2...

`lim_(n to oo)Sigma _(r=1)^n tan^-1(1/(2r^2))`=______

A

`pi/4`

B

`pi/6`

C

`pi/12`

D

`pi/3`

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