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In solving "exactable" ordinary differential equations, the following table of common exact differential forms may help.
| Exact Differential Form |
Integrating Factor |
 |
- |
 |
 |
 |
- |
 |
 |
 |
 |
 |
 |
 |
 |
 |
 |
 |
 |
 |
 |
| The above table also shows that the integrating factors for a given exact differential form are not unique. |
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