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If y is infinite and tan^(-1)y=4tan^(-1)...

If y is infinite and `tan^(-1)y=4tan^(-1)x` then

A

`x=1pmsqrt2`

B

`x=sqrt2pmsqrt3`

C

`x=3pm2sqrt2`

D

all values of x

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The correct Answer is:
A
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