1.

Solve: (x2 – ay) dx = (ax – y2 ) dy

Answer»

Writing the equation as 

x2 dx + y2 dy = a (x dy + y dx) 

x2 dx + y2 dy = a d(xy) 

∫x2 dx + ∫y2 dy = a ∫d(xy) + c 

x3/3 + y3/3 = axy + c 

Hence the general solution is x3 + y3 = 3axy + c



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