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If tan^(-1)(sqrt(1+x^2-1))/x=4^0 then...

If `tan^(-1)(sqrt(1+x^2-1))/x=4^0` then

A

`x = tan 2^(@)`

B

`x = tan 4^(@)`

C

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

D

`x = tan 8^(@)`

Text Solution

Verified by Experts

The correct Answer is:
D
`tan^(-1). (sqrt(1 + x^(2)) -1)/(x) = 4^(@) " " (x != 0)`
`rArr (sqrt(1 + x^(2)) -1)/(x) = tan4^(@)`
`rArr sqrt(1 + x^(2)) = 1 + x tan 4^(@)`
`rArr 1 + x^(2) = 2x tan 4^(@) + 1 + x^(2) tan^(2) 4^(@)`
`rArr x = 0 " or " x = (2 tan 4^(@))/(1 - tan^(2) 4^(@)) = tan 8^(@)`
Since `x != 0`, we have `x = tan 8^(@)`
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