diff-equation

Question: The solution of the differential equation $x\,dy-y\,dx=(\sqrt{{{x}^{2}}+{{y}^{2}})}dx$is



1) $y-\sqrt{{{x}^{2}}+{{y}^{2}}}=c{{x}^{2}}$
2) $y+\sqrt{{{x}^{2}}+{{y}^{2}}}=c{{x}^{2}}$
3) $y+\sqrt{{{x}^{2}}+{{y}^{2}}}+c{{x}^{2}}=0$
4) None of these
Solution: Explanation: No Explanation
Homogeneous differential equations

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