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Sigma(m=1)^ntan^-1((2m)/(m^4+m^2+2))=...

`Sigma_(m=1)^ntan^-1((2m)/(m^4+m^2+2))`=_

A

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

B

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

C

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

D

આમાથી એકપણ નહીં

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