If tan^-1 y=4 tan^-1x, then y is infinit...

If `tan^-1 y=4 tan^-1x, then y` is infinite if

A

`x = 1+ sqrt(3)`

B

`x = 1+ sqrt(2)`

C

`x = 1- sqrt(3)`

D

None of these

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The correct Answer is:

A

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