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The value of cot ^(-1) 7 + cot ^(-1) 8 ...

The value of `cot ^(-1) 7 + cot ^(-1) 8 + cot ^(-1) 18` is

A

`pi`

B

`pi/2`

C

`cot ^(-1) 5`

D

`cot ^(-1)3`

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The correct Answer is:
B
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