# Can't determine the correct integrating factor (DE)

1. Apr 18, 2010

### darryw

1. The problem statement, all variables and given/known data

Solve (x+2)sin y dx + xcos y dy = 0 by finding integrating factor mu(x)

2. Relevant equations

i put equation in standard form to get integrating factor

dy/dx + (x+2)sin y / x cos y = 0

but dont i need to get the y out of the sin and cos somehow?

so that y' + p(x)y = q(x)

I could simplify into dy/dx + (x+2/x)tan y = 0 but not sure if that even helps.

3. The attempt at a solution
1. The problem statement, all variables and given/known data

2. Relevant equations

3. The attempt at a solution