| a2-1 |
| a2+6a+9 |
| a2-9 |
| a-1 |
| a2-1 |
| a2+6a+9 |
| a2-9 |
| a-1 |
| (a+1)(a-1) |
| (a+3)2 |
| (a+3)(a-3) |
| a-1 |
| (a+1)(a-1) |
| (a+3)2 |
| 1 |
| a+1 |
| (a+3)(a-3) |
| a-1 |
| a-3 |
| a+3 |
| a-3 |
| a+3 |
| 2-3 |
| 2+3 |
| 1 |
| 5 |
| 1 |
| a+1 |
| a2-a |
| a+1 |
| 1 |
| 2 |
| 1 |
| x-1 |
| x |
| x2-1 |
| 1 |
| x |
| 1+x2 |
| x |
| a2 |
| a-2 |
| 4 |
| 2-a |
| 1 |
| a+1 |
| a2-a |
| a+1 |
| x |
| x-y |
| 2y |
| x-y |
| x-2y |
| xy |
| 1 |
| x |
| 1 |
| y |
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