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If y=sum(r=1)^(x) tan^(-1)((1)/(1+r+r^(2...

If `y=sum_(r=1)^(x) tan^(-1)((1)/(1+r+r^(2)))`, then `(dy)/(dx)` is equal to

A

`(1)/(1+x^(2))`

B

`(1)/(1+(1+x)^(2))`

C

0

D

None of these

Text Solution

Verified by Experts

The correct Answer is:
B
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