| x2 |
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| 2 |
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| ON |
| 1 |
| 2 |
| 2 |
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| 2 |
| OP |
| OM |
| ON |
| 1 |
| 2 |
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| 2 |
| x2 |
| 4 |
| y2 |
| 2 |
| OP |
| OM |
| ON |
|
| 1 |
| 2 |
| y1y2 |
| x1x2 |
| 1 |
| 2 |
| ||
| 8 |
| ||
| 4 |
| 2 |
| y1 |
| 2x1 |
| y2+y1 |
| x2+x1 |
| y1 |
| x1 |
| y2-y1 |
| x2-x1 |
| 2(y2+y1) |
| x2+x1 |
| y2-y1 |
| x2-x1 |
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|
| x2 |
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| y2 |
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