Question

Please solve this question. ​

Answer 1

Answer:

(x^2+1)

is the reason.

this is the answer

Answer 2

Answer:

1

Step-by-step explanation:

Rationalise the right to get

$2 x/ (\sqrt{x^{2} + 1 } + \sqrt{x^{2} - 1 })\\ \\2 / (\sqrt{1 + 1/x^{2} } + \sqrt{1 - 1/x^{2} })$

Since 1/x -> 0

The answer will be 2 / 2 = 1

You can use binomial expansion

(1+x)^n = 1 + nx + ..

to get the same result.