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...Section exact first order equations differential integrating factors in you studied applications of to growth and decay problems learned more about the basic ideas equa tions solution technique known as separation variables this chapter will learn solving using them real life introduces a method for equation msx yd dx nsx dy special case which represents function z fsx definition an is if there exists f two x y having continuous partial deriv atives such that sx general c from know has second partials then m n suggests following test exactness theorem let have derivatives on open disc r differen tial only fragile condition sense seemingly minor alterations can destroy its demonstrated example testing note every sxy xd yx because form msxd nsyd fxy xg xy fyx g other words separable vari but sy d not even though it obtained ables actually type by dividing both sides b cos sin fcos yg fy differs single sign same determining whether ydi ydj gradient poten means be found used find potential...