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- Feb 3rd 2010, 07:20 AM #16

- Joined
- Sep 2009
- Posts
- 82

## ok:

- Feb 3rd 2010, 01:28 PM #17
there is no one method of finding int factor but there are special cases

Two things

1)If 1/M (dN/dx - dM/dy) = f(y) then int factor is e^(integralf(y))

2) If 1/N (dM/dy- dN/dx) = f(x) tehn int factor is e^(integralf(x))

In your case 1) applies and 1/y^4 is the int factor