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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

1.`pi`

B

2.`(pi)/(5)`

C

3.`(2pi)/(5)`

D

4.`(3pi)/(5)`

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The correct Answer is:
B
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