Expressing a differential equation into a different format

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Shovon00000
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How do we express this differential equation (dy/dx)= (y/x) + tan(y/x) into this form( Mdx + Ndy=0) where M,N are functions of (x,y) ?
 
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[tex]\frac{dy}{dx}=\frac{y}{x}+\tan\frac{y}{x}=-\frac{M}{N}[/tex]
why do not you make
[tex]M=\frac{y}{x}+\tan \frac{y}{x},N=-1[/tex]
 
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