The words contained in this file might help you see if this file matches what you are looking for:

...Mathworksheet week exact equations september question separable are those that can be written in the form f y dy g x dx whenaretheseequationsalsoexact explainyourreasoning a findthevalue s ofbforwhichthegivenequationisexact xy bx b solve it for value of you found part showthattheequationbelowisnotexact show made by multiplying both sides equation integrating factor c nowthattheequationisexact solveit e turns out we make this using some sort like did previous order to nd ll have assume depends on either only or but not if were depend then would want get an ordinary differential also involve and so could vice versa dependingonyonly whichoneoftheseapproachesworksforthisequationandwhy d original extend your argument from more general m n i what conditions such used maketheequationexact whencananintegratingfactor beused...