I understand that the questions are from the 'Differential Equations' part of the syllabus. It also seems that p means dy/dxdy/dx in these types. But I am not sure about the rest of the notations and also what exactly in 'differential equations' topic do these relate to. Most of the questions I have encountered do not have other letters apart from p,x and y. Any simple reference would be much appreciated.
( 4 months ago )
These are all rather badly [b]non[/]-linear equations so do not have any simple solutions. And the third is not even an equation!