x |
x-y |
y |
y-x |
xy |
x-y |
x |
x-y |
y |
x-y |
x-y |
xy |
x-y |
x-y |
x-y |
xy |
x-y |
xy |
x-y |
xy |
a+2 |
a2-2a+1 |
a2-4a+4 |
a+1 |
a2-4 |
a2-1 |
x |
y |
y |
x |
x2+y2 |
xy |
x |
y |
y |
x |
1 |
y |
1 |
x |
1+x |
y |
x-y |
x |
2a |
a2-4 |
1 |
a-2 |
2x |
x-3 |
x |
x+3 |
x2-9 |
x |
a2+1 |
a |
(a+2)(a-1) |
a2+2a |
x |
y |
y |
x |
x+y |
x |
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