| x-y |
| x+2y |
| x2-y2 |
| x2+4xy+4y2 |
| x-y |
| x+2y |
| (x+2y)2 |
| (x+y)(x-y) |
| x+2y |
| x+y |
| y |
| x+y |
| y |
| x+y |
| 1 |
| x3 |
| 1 |
| x2 |
| 1 |
| x |
| (ab)-10 |
| (-a4b3)-3 |
| a-b |
| a-c |
| b-a |
| b-c |
| c-a |
| c-b |
| x2-1 |
| x2+x-2 |
| 1 |
| x2+2x |
| 2 |
| x+1 |
| 1 |
| x2-1 |
| x |
| x2-2x+1 |
| x-1 |
| x |
| x-2 |
| x+1 |
| 2x2-x |
| x2+2x+1 |
| 2a+3ab-2b |
| a-b-2ab |
| 1 |
| a-1 |
| a |
| a2-1 |
| a |
| a-1 |
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