Question

factorise:
${x}^{2} - 2 + \frac{1}{ {x}^{2} } - {y}^{2}$

Answer 1

x^2 + 1/x^2 - 2 - y^2

= x^2 + 1/x^2 -2.x.1/x - y^2

= ( x - 1/x)^2 - y^2

= ( x-1/x+y)(x-1/x-y)

Hope it helps

Answer 2

hope it helps...........