im stuck on a problem. Show that the ODE $\displaystyle dy/dx=\frac{2x+e^y}{1+x^2}

$, can be written in the form $\displaystyle (1+2xe^{-y})dx-(1+x^2)e^{-y}dy=0$

Im stuck and i cant figure out what to do or what method to use.

A nudge in the right direction would be good

EDIT: sorry about that, i fixed it up.

Sorry fixed the typo.. :S