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

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

A

`x^2 = 3 + 2sqrt2`

B

`x^2 = 3 - 2sqrt2`

C

`x^4 = 6x -1`

D

`x^4 = 6x^2 +1`

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A, B
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