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Q.

The solution of dydx+1x=eyx2 is
 

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a

 x = (1 + cx2)ey

b

 2x2 = (1 + cx2)e-y

c

 x2 = (1 + cx2)e-y

d

 2x = (1 + cx2)ey

answer is A.

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Detailed Solution

e-ydydx+e-yx=1x2   -(1)

Let  e-y=V

-e-ydydx=dvdx  e-ydydx=-dvdx

Putting the value in (1)

-dvdx+Vx=1x2  dvdx-Vu=-1x2I.F=e-1xdx=e-ln x=1xV1x=-1x2·1xdx+c  e-yx=-1x3dx+c  e-yx=12x2+c

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