The solution of the differential equation
$$\frac{dy}{dx} = \frac{2xy}{x^2-y^2}$$
is
- $x^2 + y^2 = cy$, where $c$ is a constant
- $x^2 + y^2 = cx$, where $c$ is a constant
- $x^2 – y^2 = cy$ , where $c$ is a constant
- $x^2 - y^2 = cx$, where $c$ is a constant