It looks like you're dealing with a complex mathematical expression, but the formatting seems a bit unclear. Could you please clarify or correct the expression? Here’s what I understood:

1. There is a term $(x^2 - 1)$.
2. There's another term that includes $x^2$, a subtraction involving $n$, and possibly some fractions involving $2n$.

Please confirm or clarify the equation, and I'll be happy to help solve or explain it.

Would you like details on any specific part of this expression? Here are five related questions that might help clarify or expand on the topic:

1. Are you dealing with a polynomial or a rational function?
2. What does "na" represent in the expression?
3. Is there a specific operation you need help with, such as solving for $x$ or simplifying the expression?
4. Is $n$ a constant or a variable in your equation?
5. Would you like to explore similar types of equations or expressions?

Tip: When dealing with complex expressions, breaking them down step by step can make the problem much easier to understand and solve.