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If f ( x) = Sigma(r=1)^(n) tan^(-1) ( ...

If ` f ( x) = Sigma_(r=1)^(n) tan^(-1) ( 1/(x^(2) + ( 2r -1) x + (r^(2) - r + 1)))" , then " | lim_(n to oo) f'(0)|` is

A

1

B

2

C

3

D

4

Text Solution

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The correct Answer is:
A
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