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If tan^(-1)x + tan^(-1)y=4pi//5, then co...

If `tan^(-1)x + tan^(-1)y=4pi//5`, then `cot^(-1)x + cot^(-1)y` is equal to

A

`pi`

B

`pi/5`

C

`(2pi)/5`

D

`(3pi)/5`

Text Solution

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The correct Answer is:
B
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HIMALAYA PUBLICATION-COMMON ENTRANCE TEST - 2017-QUESTION BANK
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