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Q.

The Solution of the differential equation  1+ex/ydx+ex/y(1x/y)dy=0 
is f(x)+g(y)ex/y=c ( here ‘c’  is arbitrary constant) then the value of f(x)x+yg(y)=______

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a

2

b

1

c

3

d

4

answer is B.

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Detailed Solution

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The given equation is  1+ex/ydxdy+ex/y(1x/y)=0
Let x = vy
dxdy=v+ydvdy1+evv+ydvdy+ev(1v)=0y1+evdvdy+v+vev+evvev=0ydvdy=v+ev1+ev1+evv+evdv=dyylnv+ev=lny+lnclncyv+ev=0cyxy+ex/y=1x+yex/y=1/c.

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