1.

`(dy)/(dx)=(x^(2)+y^(2))/(2xy)`

Answer» Correct Answer - `(x^(2)-y^(2))=Cx`
`x(dv)/(dx)=(1-v^(2))/(2v) rArr int (-2v)/(1-v^(2))dv=-int1/xdx`
`rArr log|1-v^(2)|+log|x|=log|C_(1)|`.


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