Question

Please help me with this!!! It's urgent... ​

Answer 1

Step-by-step explanation:

let √(x²-1) = a

therefore

x+a/x-a + x-a/x+a

= (x+a)²+(x-a)²/x²-a²

=2(x²+a²)/x²-a²

putting the value of a

2(x²+x²-1)/x²-x²+1

=4x²