1. The problem statement, all variables and given/known data Integrate e^(ax+by)(a*cos(xy)-y*sin(xy)) with respect to x. 2. Relevant equations None. 3. The attempt at a solution The answer is (cos(xy))(e^(ax+by)). I know that I need to treat y as a constant since I'm integrating it with respect to x but I don't know how to integrate this at all. Please help me.