The general solution of the equation $\frac{dy}{dx}=(\frac{y}{x})+\phi(\frac{x}{y})$ is given by y ln lCxl = x. Then $\phi(\frac{x}{y})$ is :

The general solution of the equation $\frac{dy}{dx}=(\frac{y}{x})+\phi(\frac{x}{y})$ is given by y ln lCxl = x. Then $\phi(\frac{x}{y})$ is :
1). $\left(-\frac{x}{y}\right)^{2}$
2). $\left(\frac{y}{x}\right)^{2}$
3). $\left(-\frac{y}{x}\right)^{2}$
4). $\left(\frac{x}{y}\right)^{2}$

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