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Question

The general solution of (2xy+1)dx+(2yx+1)dy=0 is:

A
x2+y2+xyx+y=c
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B
x2+y2xy+x+y=c
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C
x2y2+2xyx+y=c
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D
x2y22xy+xy=c
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Solution

The correct option is B x2+y2xy+x+y=c
Given differential equation is

(2xy+1)dx+(2yx+1)dy=0

2x dx+2y dy(y dx+x dy)+dx+dy=0

(2x dx+2y dy)d(xy)+dx+dy=0

On integrating both sides, we get

x2+y2xy+x+y=c

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