1.

The solution of differential equation\[yy'=x\left( \frac{{{y}^{2}}}{{{x}^{2}}}+\frac{f({{y}^{2}}/{{x}^{2}})}{f'({{y}^{2}}/{{x}^{2}})} \right)\] is

A. \[f({{y}^{2}}/{{x}^{2}})=c{{x}^{2}}\]
B. \[{{x}^{2}}f({{y}^{2}}/{{x}^{2}})={{c}^{2}}{{y}^{2}}\]
C. \[{{x}^{2}}f({{y}^{2}}/{{x}^{2}})=c\]
D. \[f({{y}^{2}}/{{x}^{2}})=cy/x\]
Answer» B. \[{{x}^{2}}f({{y}^{2}}/{{x}^{2}})={{c}^{2}}{{y}^{2}}\]


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