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Question

The solution of the differential equation x2(xdy+ydx)=(xy−1)2dx is (where c is an arbitrary constant):

A
xy1=cx
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B
xy1=cx2
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C
1xy1=1x+c
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D
1(xy1)3=1x3+c
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Solution

The correct option is C 1xy1=1x+c
We have,
x2(xdy+ydx)=(xy1)2dx
x2d(xy)=(xy1)2dx
d(xy)(xy1)2=dxx2
d(xy)(xy1)2=dxx2......................(now integrate both sides , we get)
1(xy1)=1x+c
1(xy1)=1x+k
Hence, option C is correct

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