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Q.

The solution of dxdy-23 xy=x4y3 is

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a

1x3=32(1+y2)+c e-y2

b

1x4=32(1-y2)+c ey2

c

1x3=32(1-y2)+c e-y2

d

1x4=32(1+y2)+c ey2

answer is A.

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Detailed Solution

dxdy-23xy=x4y31x4dxdy-23xyx4=x4y3x4  1x4dxdy-23yx3=y3  3x4dxdy-2( 3) 3yx3=3y3  Let 1x3=t  -3x4dxdy=dtdy  -dtdy-2ty=3y3  dtdy+2ty=-3y3P=2y,  Q=-3y3

I.F=e2y dy=ey2t.ey2=ey2.3y3 dy                      t.ey2=-32ey2y22y dy  t.ey2=-32ez.(z) dz               y2=z  t.ey2=-32ez(z-1)                    2y dy=dz  -1x3ey2=-32ey2 y2-1+c  1x3 =-32y2-1+e-y2c  1x3=321-y2+e-y2c

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