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tan^-1 (1/(1+2))+tan^-1((1)/(1+(2)(3))) ...

`tan^-1 (1/(1+2))+tan^-1((1)/(1+(2)(3))) +tan^-1((1)/(1+(3)(4)))+....+ tan^-1((1)/(1+n(n+1)))`=______________

A

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

B

`tan^-1(n+1)-pi/4`

C

0

D

`tan^-1(n+1)`

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