answer according to the book is x^2 +cxy+y^2=1 but i dont know how to get this answer.

As it stands right now it not exact since di M/ di y <> di N / di x

divide through by x^2y^2 and it will become exact.

As it stands right now it not exact since di M/ di y <> di N / di x

divide through by x^2y^2 and it will become exact.