1. The problem statement, all variables and given/known data Am I doing this correctly? Is 2y^4dx +4xy^3dy exact or inexact? 2. Relevant equations 3. The attempt at a solution So if its exact, then M(x,y)dx = N(x,y)dy right? (Euler) But how can I take partial derivative of 2y^4 with respect to x, if there is no x to derive?? thats where im stuck?