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Questions  

 The solution of differential equation x+yy1yxy1=x2+2y2+y4x2 is 

a
1x2−y2=2xy+c
b
1x2+y2=2yx+c
c
lnx2+y2=2yx+c
d
lnx2+y2=2xy=c

detailed solution

Correct option is B

xdx+ydyydx−dxy=x2+2y2+y4x2=x4+2x2y2+y4x2=x2+y22x2⇒xdx+ydyx2+y22=ydx−xdyx212∫2xdx+2ydyx2+y22=xdy−ydxx2 Integrations on both sides 12x2+y2=yx+c⇒1x2+y2=2yx+c

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