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Solve the following differential equatio...

Solve the following differential equations :
xdy+ydx=0,at x=1,y=1

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xdy+ydx=0
`impliesintdy/dx+intdx/x=int0`
`implies Inabsy+In absx=Inabsc impliesxy=c`
Now, at x=1,y=1 `implies` 1.1=c `implies`xy=1
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