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lim(n to oo) sum(r=1)^(n) cot^(-1)((r^(3...

`lim_(n to oo) sum_(r=1)^(n) cot^(-1)((r^(3)-r+(1)/(r ))/(2))` is equal to

A

0

B

`pi`

C

`(pi)/(2)`

D

`(pi)/(4)`

Text Solution

Verified by Experts

The correct Answer is:
C
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