General solution of the differential equation
\( x^{2}\left(x+y \frac{d y}{d x}\right)+\left(x \....
General solution of the differential equation
\( \mathrm{P} \)
\( x^{2}\left(x+y \frac{d y}{d x}\right)+\left(x \frac{d y}{d x}-y\right) \sqrt{x^{2}+y^{2}}=0 \), is equal to
(1) \( \frac{1}{\sqrt{x^{2}+y^{2}}}+\frac{y}{x}=C \)
(2) \( \sqrt{x^{2}+y^{2}}-\frac{y}{x}=C \)
(3) \( \sqrt{x^{2}+y^{2}}+\frac{y}{x}=C \)
(4) \( 2 \sqrt{x^{2}+y^{2}}+\frac{y}{x}=C \)
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