The solution of the differential equation xdy−ydx=(√x2+y2)dx is?
A
y−√x2+y2=Cx2
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B
y+√x2+y2=Cx2
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C
y+√x2+y2+Cx2=0
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D
None of the above
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Solution
The correct option is By+√x2+y2=Cx2 xdy−ydx=√x2+y2dx xdy=(y+√x2+y2)dx dydx=y+√x2+y2x It is homogeneous equation. Put y=vx⇒dydx=v+xdvdx v+xdvdx=vx+x√1+v2x=v+√1+v21 ⇒xdvdx=√1+v2 =⇒∫dv√1+v2=∫dxx ⇒log(v+√1+v2)=logx+logC ⇒log(yx+√x2+y2x)=logx+logC ⇒log(y+√x2+y2)−logx=logx+logC ⇒log(y+√x2+y2)=log(x2C) ⇒y+√x2+y2=x2C.