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If tan^(-1) .(sqrt(1+x^(2))-1)/x = 4^(@)...

If `tan^(-1) .(sqrt(1+x^(2))-1)/x = 4^(@)` , then

A

`x = tan 2^(@)`

B

`x = tan 4^(@)`

C

`x = tan ( 1//4)^(@)`

D

`x = tan 8^(@)`

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The correct Answer is:
D
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