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cot^(-1)(21) +cot^(-1)(13)+co^(-1)(8)=...

`cot^(-1)(21) +cot^(-1)(13)+co^(-1)(8)=`

A

0

B

`cot ^(-1) 26`

C

`pi`

D

none of these

Text Solution

Verified by Experts

The correct Answer is:
C
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