Hello

I stopped at this one :S

$\displaystyle \dfrac{dy}{dx}=x^2+y^2$

How to solve this one ?!!!

What I know:

Exact / Separable / Homogeneous

All of them are failed

am thinking about substituting $\displaystyle t=x^2+y^2$

But those squares make my life hard

If it is x+y it would be easy ..