| ||
| 4 |
| 1 |
| 2 |
| 3 |
| x2-2xy |
| y |
| x2-y2 |
| xy+y2 |
| 8 |
| x+3 |
| x+1 |
| 2x+6 |
| a2-6a+9 |
| y+5a+5a2 |
| y2-5a |
| 2a+y |
| a-y |
| a |
| a2-y |
| a2+2a |
| y |
| 2 |
| 3x+4 |
| x2-1 |
| 2 |
| x-1 |
| x+2 |
| x2-2x+1 |
| 0d+6 |
| d0-4d+4 |
| d-0 |
| d0+3d |
| t |
| d-0 |
| t |
| 0 |
| a |
| a-1 |
| a2-a |
| a2-1 |
| 1 |
| a-1 |
| x2 |
| x-2 |
| 4 |
| x-2 |
| 1 |
| x2+2x |
| 1 |
| 4 |
|
| a-1 |
| a |
| a |
| a+2 |
| 1 |
| a2+2a |
| x2-1 |
| x-1 |
| 1 |
| x+1 |
| az-1 |
| a-1 |
| az-1 |
| az+za |