10)a

To simplify the expression , we can start by rewriting it for clarity:

Now, we can expand the first two terms:

Now, let’s combine all these terms and group them properly. To handle the expression more efficiently, we can express them with a common denominator which is :

Now we have:

After combining the numerators, simplify and cancel terms wherever possible. Let’s analyze the resulting polynomial carefully to find if it can be further simplified or has a pattern.

Feel free to plug in specific values for , , and for practical numeric exploration or further refinements. This combinatorial style of working through each component lets us see how everything interacts algebraically, leading us toward a clear and simplified answer!