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The value of 5 * cot ( Sigma(k =1)^(5) ...

The value of ` 5 * cot ( Sigma_(k =1)^(5) cot ^(-1) ( k^(2) + k + 1))` is equal to

A

`5/2`

B

7

C

`-7`

D

`7/2`

Text Solution

Verified by Experts

The correct Answer is:
B
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